Details of the Researcher

PHOTO

Yudai Ichikawa
Section
Graduate School of Science
Job title
Associate Professor
Degree

  • 博士（理学）（京都大学）

  • 修士（理学）（京都大学）

e-Rad No.
50756244

Research Areas 1

  • Natural sciences / Particle, nuclear, cosmic-ray, and astrophysics - experiment /

Awards 3

  1. New face award

    2015/10　Strange dibaryon system produced in the d(pi+, K+) reaction at J-PARC

  2. ASRC Director general's award

    2014/03　Study the kaonic nuclei by using pion induced reaction

  3. Incentive Prize

    2014/02　International School for Strange Nuclear Physics (SNP School 2014)　Search for light kaonic nuclei “K-pp” via the d(π+, K+) reaction at J-PARC

Papers 102

  1. Femtoscopic study in the J-PARC-HI project

    Yudai Ichikawa, Kazuya Aoki, Masakiyo Kitazawa, Yuhei Morino, Hiroyuki Sako, Kazuhiro Tanaka

    Journal of Subatomic Particles and Cosmology　3　100040-100040　2025/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.jspc.2025.100040 　

    ISSN： 3050-4805

  2. Spectroscopic study of Kaonic nuclei using inclusive and exclusive 12C(K-, p) reaction at J-PARC

    Fumiya Oura, J.K. Ahn, S.W. Choi, M. Fujita, S. Hasegawa, T.K. Harada, S.H. Hayakawa, K. Hicks, S.H. Hwang, Y. Ichikawa, Y. Ishikawa, K. Imai, W.S. Jung, B.M. Kang, S. Kajikawa, K. Kamada, S.H. Kim, T. Kitaoka, J.W. Lee, T. Morino, M. Saito, H. Sako, T. Sakao, S. Sato, H. Tamura, K. Tanida, T. Takahashi, M. Ukai, S. Wada, T.O. Yamamoto, S.B. Yang

    Proceedings of 10th International Conference on Quarks and Nuclear Physics — PoS(QNP2024)　209-209　2025/02/07

    Publisher: Sissa Medialab

    DOI： 10.22323/1.465.0209 　

  3. Missing-Mass Measurement of the 12C(K-, K+) Reaction at 1.8 GeV/c with the Superconducting Kaon Spectrometer

    Yudai Ichikawa, Jung Keun Ahn, Yuya Akazawa, Kanae Aoki, Elena Botta, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Manami Fujita, Toshiyuki Gogami, Shoichi Hasegawa, Tomoyuki Hasegawa, Shuhei Hayakawa, Tomonori Hayakawa, Ryotaro Honda, Kenji Hosomi, Ken'ichi Imai, Wooseung Jung, Shunsuke Kanatsuki, Shin Hyung Kim, Shinji Kinbara, Kazuya Kobayashi, Jaeyong Lee, Simonetta Marcello, Koji Miwa, Taejin Moon, Tomofumi Nagae, Yoshiyuki Nakada, Manami Nakagawa, Takuya Nanamura, Megumi Naruki, Atsushi Sakaguchi, Hiroyuki Sako, Yuki Sasaki, Susumu Sato, Kotaro Shirotori, Hitoshi Sugimura, Toshiyuki Takahashi, Hirokazu Tamura, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Takeshi O. Yamamoto

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS　2024　(9)　2024/09/18

    DOI： 10.1093/ptep/ptae133 　

    ISSN： 2050-3911

    eISSN： 2050-3911

  4. Superconducting dipole magnet for Hyperon spectrometer

    Ahn, J.K., Choi, S., Hasegawa, S., Hayakawa, S.H., Hong, J., Ichikawa, Y., Imai, K., Kim, S.H., Makida, Y., Ohhata, H., Sako, H., Sasaki, K., Sato, S., Takahashi, T., Tanida, K., Yoshida, J.

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　1047　2023

    DOI： 10.1016/j.nima.2022.167775 　

    ISSN： 0168-9002

  5. $\Xi^-$ atomic X-ray spectroscopy using a counter-emulsion hybrid method Peer-reviewed

    Fujita Manami, Hasegawa Shoichi, Hosomi Kenji, Ichikawa Masaya, Ichikawa Yudai, Kim S., Nanamura Takuya, Sako Hiroyuki, Tamura Hirokazu, Yamamoto Takeshi, 32 of others*

    Progress of Theoretical and Experimental Physics (Internet)　2022　(12)　123D01\_1-123D01\_17　2022/12

    DOI： 10.1093/ptep/ptac156 　

    ISSN： 2050-3911

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    $\Xi^-$ atomic X-ray spectroscopy is one of the most useful methods for investigation of the $\Xi$-nucleus strong interaction. Since the X-ray energy is shifted and/or broadened due to the $\Xi$-nucleus strong interaction compared to those calculated from electromagnetic interaction alone, the measurement of the energy shift, $\Delta$E, and the width, $\Gamma$, give us information on the $\Xi$-nucleus potential. A serious problem in the measurement is the significant background derived from in-flight $\Xi^-$ decay. A novel method of identifying stopped $\Xi^-$ events using the nuclear emulsion was developed to realize the first $\Xi^-$ atomic X-ray spectroscopy experiment as the J-PARC E07 experiment, which also aimed at searching for $\Lambda\Lambda$ and $\Xi^-$ hypernuclei in the emulsion. The X-rays emitted from $\Xi^-$ Br and $\Xi^-$ Ag atoms were measured using germanium detectors. No clear peaks were observed in the obtained spectra. However, we succeeded in reducing the background to 1/170 by this method employing coincidence measurements using nuclear emulsion and X-ray detectors.

  6. The J-PARC heavy ion project

    Kyoichiro Ozawa, Kazuya Aoki, Shin-ichi Esumi, Taku Gunji, Takashi Hachiya, Hiroyuki Harada, Yudai Ichikawa, Masakiyo Kitazawa, Yasuo Miake, Yuhei Morino, Shoji Nagamiya, Yasushi Nara, Megumi Naruki, Takafumi Niida, Toshihiro Nonaka, Takehiko R. Saito, Takao Sakaguchi, Hiroyuki Sako, Susumu Sato, Hitoshi Takahashi, Hirokazu Tamura, Kazuhiro Tanaka, Satoshi Yokkaichi

    EPJ Web of Conferences　271　11004-11004　2022/11/09

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227111004 　

    eISSN： 2100-014X

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    A project to study high-density nuclear matter using heavy ion collisions in a beam energy range of few GeV is being prepared at J-PARC. The goal of the project is to perform experiments with beam energies of 1-12 AGeV/c and the collision rate of 1011 Hz. The project is divided into two phases. For the first stage, measurements with a limited beam intensity will be performed with upgraded spectrometer of an on-going experiment. Full performance will be implemented at the second phase to study in detail the high density matter and light hypernuclei. Feasibility of measurements for both phases are being evaluated.

  7. Recent progress and future prospects of hyperon nucleon scattering experiment Invited Peer-reviewed

    Koji Miwa, Takuya Nanamura, Tamao Sakao, J. K. Ahn, Y. Akazawa, T. Aramaki, S. Ashikaga, S. Callier, N. Chiga, N. Chiga, S. W. Choi, H. Ekawa, P. Evtoukhovitch, N. Fujioka, M. Fujita, T. Gogami, T. Harada, S. Hasegawa, S. H. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ieiri, M. Ikedai, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, S. Kajikawa, H. Kanauchi, H. Kanda, T. Kitaoka, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, T. Koike, K. Matsuda, Y. Matsumoto, S. Nagao, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, M. Naruki, S. Ozawa, L. Raux, T. G. Rogers, A. Sakaguchi, H. Sako, S. Sato, T. Shiozaki, K. Shirotori, K. N. Suzuki, S. Suzuki, M. Tabata, C. d. L. Taille, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, M. Tanaka, K. Tanida, Z. Tsamalaidze, M. Ukai, H. Umetsu, S. Wada, T. O. Yamamoto, J. Yoshida, K. Yoshimura

    EPJ Web of Conferences　271　04001-04001　2022/11/09

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227104001 　

    eISSN： 2100-014X

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    A new hyperon-proton scattering experiment, dubbed J-PARC E40, was performed to measure differential cross sections of the Σ+p, Σ−p elastic scatterings and the Σ−p → Λn scattering by identifying a lot of Σ particles in the momentum ranging from 0.4 to 0.8 GeV/c produced by the π±p → K+Σ± reactions. We successfully measured the differential cross sections of these three channels with a drastically improved accuracy with a fine angular step. These new data will become important experimental constraints to improve the theories of the two-body baryon-baryon interactions. Following this success, we proposed a new experiment to measure the differential cross sections and spin observables by using a highly polarized Λ beam for providing quantitative information on the ΛN interaction. The results of three Σp channels and future prospects of the Λp scattering experiment are described.

  8. Measurement of differential cross sections for $\Sigma^+ p$ elastic scattering in the momentum range 0.44-0.80 GeV/c Peer-reviewed

    Nanamura Takuya, Fujita Manami, Hasegawa Shoichi, Ichikawa Masaya, Ichikawa Yudai, Imai Kenichi*, Naruki Megumi, Sato Susumu, Sako Hiroyuki, Tamura Hirokazu, Tanida Kiyoshi, Yamamoto Takeshi, 59 of others*

    Progress of Theoretical and Experimental Physics (Internet)　2022　(9)　093D01\_1-093D01\_35　2022/09

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/ptep/ptac101 　

    ISSN： 2050-3911

    eISSN： 2050-3911

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    We performed a novel $\Sigma^+p$ scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 $\Sigma^+p$ elastic scattering events were identified from $4.9 \times 10^7$ tagged $\Sigma^+$ particles in the $\Sigma^+$ momentum range 0.44 - 0.80 GeV/c. The differential cross sections of the $\Sigma^+p$ elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the $^3S_1$ and $^1P_1$ channels for the first time. The phase shift of the 3S1 channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated to be $20^\circ<|\delta_{^3S_1}|<35^\circ$. If the sign of $\delta_{^3S_1}$ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.

  9. X-ray spectroscopy experiments on exotic Xi atoms at J-PARC

    Takeshi O Yamamoto, N. Chiga, H. Ekawa, M. Fujita, T. Gogami, T. Harada, S.H. Hayakawa, K. Hosomi, Y. Ichikawa, Y. Ishikawa, K. Kamada, H. Kanauchi, T. Koike, K. Miwa, T. Nagae, Y. Ogura, F. Oura, T.G. Rogers, T. Takahashi, H. Tamura, K. Tanida, M. Ukai, J. Yoshida

    Proceedings of Particles and Nuclei International Conference 2021 — PoS(PANIC2021)　2022/03/31

    Publisher: Sissa Medialab

    DOI： 10.22323/1.380.0211 　

  10. Precise Measurement of Differential Cross Sections of the Σ-p → Λn Reaction in Momentum Range 470-650 MeV /c Peer-reviewed

    K. Miwa, J. K. Ahn, Y. Akazawa, T. Aramaki, S. Ashikaga, S. Callier, N. Chiga, S. W. Choi, H. Ekawa, P. Evtoukhovitch, N. Fujioka, M. Fujita, T. Gogami, T. Harada, S. Hasegawa, S. H. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ieiri, M. Ikeda, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, S. Kajikawa, H. Kanauchi, H. Kanda, T. Kitaoka, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, T. Koike, K. Matsuda, Y. Matsumoto, S. Nagao, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, T. Nanamura, M. Naruki, S. Ozawa, L. Raux, T. G. Rogers, A. Sakaguchi, T. Sakao, H. Sako, S. Sato, T. Shiozaki, K. Shirotori, K. N. Suzuki, S. Suzuki, M. Tabata, C. D.L. Taille, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, M. Tanaka, K. Tanida, Z. Tsamalaidze, M. Ukai, H. Umetsu, S. Wada, T. O. Yamamoto, J. Yoshida, K. Yoshimura

    Physical Review Letters　128　(7)　072501　2022/02/18

    DOI： 10.1103/PhysRevLett.128.072501 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  11. Strangeness physics programs by S-2S at J-PARC

    Toshiyuki Gogami, Patrick Achenbach, Jung Keun Ahn, Darko Androić, Kanae Aoki, Arshak Asaturyan, Elena Botta, Masroor. H. Bukhari, Alexandre Camsonne, Silviu. C. Covrig, Kengo Ebata, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Hiroyuki Fujioka, Manami Fujita, Franco Garibaldi, Takeshi. K. Harada, Shoichi Hasegawa, Tomoyuki Hasegawa, Shuhei. H. Hayakawa, Erina Hirose, Ryotaro Honda, Kenji Hosomi, Yudai Ichikawa, Kenichi Imai, Tatsuhiro Ishige, Wooseung Jung, Kento Kamada, Shunsuke Kanatsuki, Seigo Kato, Shinhyung. H. Kim, Takumi Kobori, Simonetta Marcello, Pete Markowitz, Koji Miwa, Arthur Mkrtchyan, Hamlet Mkrtchyan, Manabu Moritsu, Tomofumi Nagae, Sho Nagao, Manami Nakagawa, Satoshi. N. Nakamura, Takuya Nanamura, Megumi Naruki, Ryosuke Negishi, Kazuki Okuyama, Fumiya Oura, Bishnu Pandey, Josef Pochodzalla, Atsushi Sakaguchi, Tamao Sakao, Hiroyuki Sako, Chhanda Samanta, Susumu Sato, Mitra. H. Shabestari, Albert Shahinyan, Kotaro Shirotori, Simon Širca, C. Son, Hitoshi Sugimura, Hitoshi Takahashi, Shuji Takahashi, Tomonori Takahashi, Toshiyuki Takahashi, Hirokazu Tamura, Kiyoshi Tanida, Atsushi Tokiyasu, Zviadi Tsamalaidze, Makoto Uchida, Mifuyu Ukai, Chiaki Une, Guido. M. Urciuoli, Takeshi. O. Yamamoto

    EPJ Web of Conferences　271　11002-11002　2022

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227111002 　

    eISSN： 2100-014X

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    In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of Δp/p = 6 × 10−4 in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of Ξ12Be) and E94 (missing-mass spectroscopy of Λ7Li, Λ10B, and Λ12C) experiments.

  12. J-PARC hadron experimental facility extension project *

    Fuminori Sakuma, Kazuya Aoki, Hiroyuki Fujioka, Toshiyuki Gogami, Yoshimasa Hidaka, Emiko Hiyama, Ryotaro Honda, Atsushi Hosaka, Yudai Ichikawa, Masaharu Ieiri, Masahiro Isaka, Noriyoshi Ishii, Takatsugu Ishikawa, Yusuke Komatsu, Takeshi Komatsubara, GeiYoub Lim, Koji Miwa, Yuhei Morino, Tomofumi Nagae, Sho Nagao, Satoshi N. Nakamura, Hajime Nanjo, Megumi Naruki, Hidekatsu Nemura, Tadashi Nomura, Hiroyuki Noumi, Hiroaki Ohnishi, Kyoichiro Ozawa, Shinya Sawada, Takayasu Sekihara, Sang-In Shim, Koji Shiomi, Kotaro Shirotori, Yasuhisa Tajima, Hitoshi Takahashi, Toshiyuki Takahashi, Sachiko Takeuchi, Makoto Takizawa, Hirokazu Tamura, Kiyoshi Tanida, Mifuyu Ukai, Takeshi O. Yamamoto, Yasuo Yamamoto

    EPJ Web of Conferences　271　11001-11001　2022

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227111001 　

    eISSN： 2100-014X

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    The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through experiments with intense particle beams. In the past decade, many results from particle and nuclear physics experiments have been obtained at the present facility. To expand the physics programs to as yet unexplored regions, the extension project of the Hadron Experimental Facility has been extensively discussed. This contribution presents the physics of the extension of the Hadron Experimental Facility to resolve issues related to strangeness nuclear physics, hadron physics, and flavor physics.

  13. Preparation status of missing-mass spectroscopy for 𝚵 hypernuclei with S-2S magnetic spectrometer

    Kengo Ebata, H. Fujioka, M. Fujita, T. Gogami, T. K. Harada, S. H. Hayakawa, R. Honda, Y. Ichikawa, K. Kamada, T. Kobori, K. Miwa, T. Nagae, T. Nanamura, R. Negishi, F. Oura, T. Sakao, C. Son, T. Takahashi, H. Takahashi, H. Tamura, A. O. Tokiyasu, M. Ukai, T. O. Yamamoto

    EPJ Web of Conferences　271　03008-03008　2022

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227103008 　

    eISSN： 2100-014X

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    J-PARC E70 experiment measures the missing-mass of Ξ hypernuclei (12ΞBe) in Hadron Experimental Facility at J-PARC. We aim to reach the best missing-mass resolution of 2 MeV/c2 in FWHM with a new magnetic spectrometer S-2S. The high-resolution spectroscopy of Ξ hypernuclei will play an important role to understand the unknown ΞN interaction. The experiment will start at the beginning of 2023. This article presents the preparation status.

  14. High resolution spectroscopy of 𝚵 hypernuclei with active fiber target

    Takeshi K. Harada, K. Ebata, T. Gogami, S. H. Hayakawa, R. Honda, Y. Ichikawa, K. Miwa, T. Nagae, T. Nanamura, T. Takahashi, M. Ukai, T. O. Yamamoto

    EPJ Web of Conferences　271　03006-03006　2022

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227103006 　

    eISSN： 2100-014X

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    We are planning to carry out a high-resolution spectroscopy of Ξ hypernucleus at the J-PARC K1.8 beamline, which provides a highintensity K− beam (J-PARC E70 experiment). The high-resolution spectroscopy aims to be realized by introducing a new magnetic spectrometer S-2S and an active fiber target AFT. In this article, the role of the AFT in this experiment and its development status are described.

  15. X ray spectroscopy on 𝚵− atoms (J-PARC E03, E07 and future)

    Takeshi. O. Yamamoto, M. Fujita, T. Gogami, T. K. Harada, S. H. Hayakawa, K. Hosomi, Y. Ichikawa, Y. Ishikawa, K. Kamada, H. Kanauchi, T. Koike, K. Miwa, T. Nagae, F. Oura, T. Takahashi, H. Tamura, K. Tanida, M. Ukai

    EPJ Web of Conferences　271　03001-03001　2022

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227103001 　

    eISSN： 2100-014X

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    X-ray spectroscopy of hadronic atoms is a powerful method to study strong interaction between hadrons and nuclei. At J-PARC, we have conducted two experiments, J-PARC E07 and E03, for hadronic atoms with a doubly strange hyperon, Ξ−, aiming at the world-first detection of their X-rays. The first measurement is performed as a byproduct of J-PARC E07 experiment with the hybrid emulsion technique. The second one, J-PARC E03, is a dedicated experiment for detection of Ξ− Fe atom X rays. The preliminary results and the present status of E07 and E03 are shown in this article. Future prospects of Ξ−-atomic X-ray spectroscopy are also discussed. A new measurement has been proposed for detecting Ξ− C atom X rays, where a novel Ξ− tracking method will be applied to realize an improved signal to noise ratio.

  16. High resolution spectroscopy of the “ΣN cusp” by using the d(K−, π−) reaction

    Yudai Ichikawa, Jungkeun Ahn, Sungwook Choi, Manami Fujita, Toshiyuki Gogami, Shoichi Hasegawa, Takeshi Harada, Shuhei Hayakawa, Shigeru Ishimoto, Woose-ung Jung, Byungmin Kang, Shinhyung Kim, Koji Miwa, Tomofumi Nagae, Takuya Nanamura, Hiroyuki Sako, Susumu Sato, Shoji Suzuki, Hirokazu Tamura, Kiyoshi Tanida, Mifuyu Ukai, Takeshi Yamamoto, Seongbae Yang

    EPJ Web of Conferences　271　02012-02012　2022

    Publisher: EDP Sciences

    DOI： 10.1051/epjconf/202227102012 　

    eISSN： 2100-014X

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    We present a new proposal, J-PARC E90, to measure a missing-mass spectrum near the ΣN threshold for the d(K−, π−) reactions at 1.4 GeV/c. While many previous experiments support apparent enhancement near the ΣN thresh-old, the dynamical origin of this so-called “ΣN cusp” remains yet unsolved. The enhancement suggests either a cusp structure or a weakly bound state. One of the keys to making it clear is improving the missing-mass resolution and statistics. Our new experiment can achieve the missing-mass resolution of 0.4 MeV in σ using the K1.8 beam line and S-2S spectrometers at J-PARC. Further-more, we can suppress quasi-free background processes with the time projection chamber (HypTPC), which operated nicely for the H-dibaryon search experi-ment (J-PARC E42). The J-PARC E90 aims to extract the scattering length of the ΣN system with isospin T = 1/2 and spin-triplet channels.

  17. Extension of the J-PARC Hadron Experimental Facility: Third White Paper

    Aoki, Kazuya, Fujioka, Hiroyuki, Gogami, Toshiyuki, Hidaka, Yoshimasa, Hiyama, Emiko, Honda, Ryotaro, Hosaka, Atsushi, Ichikawa, Yudai, Ieiri, Masaharu, Isaka, Masahiro, Ishii, Noriyoshi, Ishikawa, Takatsugu, Komatsu, Yusuke, Komatsubara, Takeshi, Lim, GeiYoub, Miwa, Koji, Morino, Yuhei, Nagae, Tomofumi, Nagao, Sho, Nakamura, Satoshi N, Nanjo, Hajime, Naruki, Megumi, Nemura, Hidekatsu, Nomura, Tadashi, Noumi, Hiroyuki, Ohnishi, Hiroaki, Ozawa, Kyoichiro, Sakuma, Fuminori, Sawada, Shinya, Sekihara, Takayasu, Shim, Sang-In, Shiomi, Koji, Shirotori, Kotaro, Tajima, Yasuhisa, Takahashi, Hitoshi, Takahashi, Toshiyuki, Takeuchi, Sachiko, Takizawa, Makoto, Tamura, Hirokazu, Tanida, Kiyoshi, Ukai, Mifuyu, Yamamoto, Takeshi O, Yamamoto, Yasuo

    eprint arXiv:2110.04462　2021/10

    DOI： 10.48550/arXiv.2110.04462 　

  18. Measurement of the differential cross sections of the elastic scattering in momentum range 470 to 850 MeV/c Peer-reviewed

    K. Miwa, J. K. Ahn, Y. Akazawa, T. Aramaki, S. Ashikaga, S. Callier, N. Chiga, S. W. Choi, H. Ekawa, P. Evtoukhovitch, N. Fujioka, M. Fujita, T. Gogami, T. Harada, S. Hasegawa, S. H. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ieiri, M. Ikeda, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, S. Kajikawa, H. Kanauchi, H. Kanda, T. Kitaoka, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, T. Koike, K. Matsuda, Y. Matsumoto, S. Nagao, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, T. Nanamura, M. Naruki, S. Ozawa, L. Raux, T. G. Rogers, A. Sakaguchi, T. Sakao, H. Sako, S. Sato, T. Shiozaki, K. Shirotori, K. N. Suzuki, S. Suzuki, M. Tabata, C. d.L. Taille, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, M. Tanaka, K. Tanida, Z. Tsamalaidze, M. Ukai, H. Umetsu, S. Wada, T. O. Yamamoto, J. Yoshida, K. Yoshimura

    Physical Review C　104　(4)　2021/10

    DOI： 10.1103/PhysRevC.104.045204 　

    ISSN： 2469-9985

    eISSN： 2469-9993

  19. First observation of a nuclear s-state of a Ξ hypernucleus, 15<inf>Ξ</inf>C

    M. Yoshimoto, J. K. Ahn, B. Bassalleck, H. Ekawa, Y. Endo, M. Fujita, Y. Han, T. Hashimoto, S. H. Hayakawa, K. Hicks, K. Hoshino, S. Hoshino, S. H. Hwang, Y. Ichikawa, M. Ichikawa, K. Imai, Y. Ishikawa, H. Kanauchi, A. Kasagi, S. H. Kim, S. Kinbara, P. M. Lin, T. L. Ma, K. Miwa, A. T. Moe, Y. Nagase, K. Nakazawa, T. Nanamura, M. Naruki, A. N.L. Nyaw, J. Pochodzalla, H. Sako, S. Sato, M. M. Soe, M. K. Soe, J. Y. Sohn, H. Takahashi, T. Takahashi, H. Tamura, K. Tanida, A. M.M. Theint, K. T. Tint, M. Ukai, T. O. Yamamoto, S. B. Yang, C. S. Yoon, J. Yoshida, D. H. Zhang, Z. Zhang

    Progress of Theoretical and Experimental Physics　2021　(7)　2021/07/01

    DOI： 10.1093/ptep/ptab073 　

    eISSN： 2050-3911

  20. Study of \(\Lambda \) Identification Method by the \(\pi ^{ - }p \to K^{0}\Lambda \) Reaction for a \(\Lambda p\) Scattering Experiment at J-PARC

    T. Sakao, J. K. Ahn, Y. Akazawa, T. Aramaki, S. Ashikaga, S. Callier, S. W. Choi, P. Evtoukhovitch, N. Fujioka, M. Fujita, T. Gogami, T. Harada, S. Hasegawa, S. H. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ikeda, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, S. Kajikawa, H. Kanauchi, H. Kanda, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, K. Matsuda, Y. Matsumoto, K. Miwa, S. Nagao, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, T. Nanamura, M. Naruki, S. Ozawa, L. Raux, T. Rogers, A. Sakaguchi, H. Sako, S. Sato, K. Shirotori, K. N. Suzuki, S. Suzuki, M. Tabata, C. d. L. Taille, H. Takahashi, T. N. Takahashi, T. Takahashi, M. Tanaka, K. Tanida, H. Tamura, Z. Tsamalaidze, M. Ukai, H. Umetsu, T. O. Yamamoto, J. Yoshida, K. Yoshimura

    Proceedings of the 3rd J-PARC Symposium (J-PARC2019)　2021/03/26

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.33.011133 　

  21. Establishment of a Modern Experimental Technique of a \(\Sigma p\) Scattering Experiment at J-PARC

    Yuya Akazawa, J. K. Ahn, T. Aramaki, S. Ashikaga, S. Callier, N. Chiga, S. W. Choi, H. Ekawa, P. Evtoukhovitch, N. Fujioka, M. Fujita, T. Gogami, T. Harada, S. Hasegawa, S. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ieiri, M. Ikeda, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, S. Kajikawa, H. Kanauchi, H. Kanda, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, T. Koike, K. Matsuda, Y. Matsumoto, K. Miwa, S. Nagao, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, T. Nanamura, M. Naruki, S. Ozawa, L. Raux, T. Rogers, A. Sakaguchi, T. Sakao, H. Sako, S. Sato, T. Shiozaki, K. Shirotori, K. N. Suzuki, S. Suzuki, M. Tabata, C. d. L. Taille, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, M. Tanaka, K. Tanida, Z. Tsamalaidze, H. Umetsu, M. Ukai, T. O. Yamamoto, J. Yoshida, K. Yoshimura

    Proceedings of the 3rd J-PARC Symposium (J-PARC2019)　2021/03/26

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.33.011134 　

  22. Time Projection Chamber “HypTPC” for the Hadron Spectroscopy at J-PARC

    Yudai Ichikawa, Jung Keun Ahn, Takaya Akaishi, Sakiko Ashikaga, Sungwook Choi, Kenneth Hicks, Hiroyuki Ekawa, Shoichi Hasegawa, Shuhei Hayakawa, Ken’ichi Imai, Shigeru Ishimoto, Wooseung Jung, Byungmin Kang, Shin Hyung Kim, Jaeyong Lee, Takuya Nanamura, Hiroyuki Sako, Ken’ichi Sasaki, Susumu Sato, Kotaro Shirotori, Kazuki Suzuki, Shoji Suzuki, Toshiyuki Takahashi, Kiyoshi Tanida, Seongbae Yang, Junya Yoshida

    Proceedings of the 3rd J-PARC Symposium (J-PARC2019)　2021/03/26

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.33.011103 　

  23. J-PARC E07; Systematic study of double strangeness system with hybrid emulsion method Peer-reviewed

    Yoshida Junya, Akaishi Takaya, Fujita Manami, Hasegawa Shoichi, Hashimoto Tadashi, Hosomi Kenji, Ichikawa Masaya, Ichikawa Yudai, Imai Kenichi*, Kim S., Nanamura Takuya, Naruki Megumi, Sako Hiroyuki, Sato Susumu, Tamura Hirokazu, Tanida Kiyoshi, Yamamoto Takeshi, 86 of others*

    JPS Conference Proceedings (Internet)　33　011112\_1-011112\_8　2021/03

    DOI： 10.7566/JPSCP.33.011112 　

    ISSN： 2435-3892

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    J-PARC E07 is the most ambitious and complex emulsion experiment to date investigating double hypernuclei with Hybrid emulsion method. The physics run at the K1.8 beam line in the J-PARC hadron experimental facility have been completed in 2017. The emulsion sheets are presently being analyzed with dedicated optical microscopes. Current statistics are estimated to be more 3 times than that of previous experiments. Quantitative data on the $\Lambda \Lambda$ and $\Xi N$ interaction are being accumulated successfully via analysis of double $\Lambda$ and $\Xi$ hypernuclei. Multiple $\Xi$ hypernucleus candidates suggests several features about $\Xi$ hypernucleus that the identification efficiency of $^{15}_\Xi$C is significantly higher than other mode, many daughters of $^{15}_\Xi$C are identified as He or Be, and multiple bound states of $\Xi^-$ exist in the $^{14}$N nucleus. An analysis of X-ray spectroscopy of $\Xi^-$ hyperatoms are ongoing.

  24. Observation of Coulomb-assisted nuclear bound state of $\Xi^-$-$^{14}$N system Peer-reviewed

    Hayakawa Shuhei, Fujita Manami, Hasegawa Shoichi, Hashimoto Tadashi, Hosomi Kenji, Ichikawa Yudai, Imai Kenichi*, Nanamura Takuya, Naruki Megumi, Sako Hiroyuki, Sato Susumu, Tamura Hirokazu, Tanida Kiyoshi, Yamamoto Takeshi, 84 of others*

    Physical Review Letters　126　(6)　062501\_1-062501\_6　2021/02

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevLett.126.062501 　

    ISSN： 0031-9007

    eISSN： 1079-7114

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    In an emulsion-counter hybrid experiment performed at J-PARC, a $\Xi^-$ absorption event was observed which decayed into twin single-$\Lambda$ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as $\Xi^{-} + ^{14}$N$\ \rightarrow\ ^{10}_\Lambda$Be + $^5_\Lambda$He. For the binding energy of the $\Xi^{-}$ hyperon in the $\Xi^-$-$^{14}$N system a value of $1.27 \pm 0.21$ MeV was deduced. The energy level of $\Xi^-$ is likely a nuclear $1p$ state which indicates a weak ${\Xi}N$-$\Lambda\Lambda$ coupling.

  25. Study on the baryon interaction by $\Xi$ hypernuclear spectroscopy with the $(K^-, K^+)$ reaction Peer-reviewed

    Gogami Toshiyuki*, Fujita Manami, Hasegawa Shoichi, Hosomi Kenji, Imai Kenichi*, Ichikawa Yudai, Nanamura Takuya, Naruki Megumi, Sako Hiroyuki, Sato Susumu, Tamura Hirokazu, Tanida Kiyoshi, Yamamoto Takeshi, 40 others*

    Journal of Physics; Conference Series　1643　012133\_1-012133\_6　2020/12

    Publisher: IOP Publishing

    DOI： 10.1088/1742-6596/1643/1/012133 　

    ISSN： 1742-6588

    eISSN： 1742-6596

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    We performed $\Xi$ hypernuclear spectroscopy with the $(K^-, K^+)$ reaction at J-PARC to investigate the $\Xi N$ interaction (J-PARC E05). A new experiment (J-PARC E70) in which a better energy resolution could be achieved is now being prepared. In this article, an analysis status of J-PARC E05 and a preparation status of J-PARC E70 are described.

  26. Study of $\Sigma N$ interaction from the $\Sigma p$ scattering experiment at J-PARC Peer-reviewed

    Miwa Koji*, Fujita Manami, Hasegawa Shoichi, Hosomi Kenji, Ichikawa Masaya, Ichikawa Yudai, Imai Kenichi*, Nanamura Takuya, Naruki Megumi, Sako Hiroyuki, Sato Susumu, Tamura Hirokazu, Tanida Kiyoshi, Yamamoto Takeshi, 55 others*

    Journal of Physics; Conference Series　1643　(1)　012174\_1-012174\_6　2020/12

    Publisher: IOP Publishing

    DOI： 10.1088/1742-6596/1643/1/012174 　

    ISSN： 1742-6588

    eISSN： 1742-6596

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    A high statistics $\Sigma p$ scattering experiment has been performed at the K1.8 beamline in the J-PARC Hadron Experimental Facility. Data for momentum-tagged $\Sigma^-$ beam running in a liquid hydrogen target were accumulated by detecting the $\pi^{-}p \to {K}^{+}{\Sigma}^{-}$ reaction with a high intensity $\pi^-$ beam of 20 M/spill. The number of the $\Sigma^-$ beam was about $1.7 \times 10^7$ in total. The $\Sigma^- p$ elastic scattering and the $\Sigma^- p \to \Lambda n$ inelastic scattering events were successfully observed with about 100 times larger statistics than that in past experiments.

  27. An event excess observed in the deeply bound region of the C-12(K-,p) missing-mass spectrum

    Yudai Ichikawa, Junko Yamagata-Sekihara, Jung Keun Ahn, Yuya Akazawa, Kanae Aoki, Elena Botta, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Manami Fujita, Toshiyuki Gogami, Shoichi Hasegawa, Tomoyuki Hasegawa, Shuhei Hayakawa, Tomonori Hayakawa, Satoru Hirenzaki, Ryotaro Honda, Kenji Hosomi, Ken'ichi Imai, Wooseung Jung, Shunsuke Kanatsuki, Shin Hyung Kim, Shinji Kinbara, Kazuya Kobayashi, Jaeyong Lee, Simonetta Marcello, Koji Miwa, Taejin Moon, Tomofumi Nagae, Yoshiyuki Nakada, Manami Nakagawa, Takuya Nanamura, Megumi Naruki, Atsushi Sakaguchi, Hiroyuki Sako, Susumu Sato, Yuki Sasaki, Kotaro Shirotori, Hitoshi Sugimura, Toshiyuki Takahashi, Hirokazu Tamura, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Takeshi O. Yamamoto

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS　2020　(12)　2020/12

    DOI： 10.1093/ptep/ptaa139 　

    ISSN： 2050-3911

  28. Development of a time projection chamber for J-PARC hadron physics program

    Shin Hyung Kim, Yudai Ichikawa, Hiroyuki Sako, Jung Keun Ahn

    Journal of Physics: Conference Series　1498　(1)　2020/06/11

    DOI： 10.1088/1742-6596/1498/1/012023 　

    ISSN： 1742-6588

    eISSN： 1742-6596

  29. “Analysis status of Σ-p channel in the Σp scattering experiment (J-PARC E40)”

    Matsuda K., Miwa K., Honda R., Fujioka N., Kanauchi H., Ishikawa Y., Tamura H., Aramaki T., Sakao T., Kajikawa S., Nagao S., Fujita M., Ikeda M., Matsumoto Y., Ozawa S., Shiozaki T., Umetsu H., Rogers T., Nakada Y., Hoshino S., Nagatomi R., Kobayashi K., Shirotori K., Nanamura T., Ashikaga S., Ichikawa M., Suzuki K., Gogami T., Harada T., Takahashi T., Ukai M., Suzuki S., Akazawa Y., Ieiri M., Ishimoto S., Ichikawa Y., Tanida K., Yamamoto T., Hayakawa S., Yoshida J., Ekawa H., Kim S. H., Kang B. M., Jung W. S., Choi S. W., the J-PARC E40 Collaboration

    Meeting Abstracts of the Physical Society of Japan　75.1　390-390　2020

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.75.1.0_390 　

    eISSN： 2189-0803

  30. Operation of Multi-MPPC System for Cylindrical Scintillation Fiber Tracker Peer-reviewed

    Yuya Akazawa, J. K. Ahn, T. Aramaki, S. Ashikaga, S. Callier, N. Chiga, S. W. Choi, H. Ekawa, P. Evtoukhovitch, N. Fujioka, M. Fujita, S. Hasegawa, S. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ieiri, M. Ikeda, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, H. Kanauchi, H. Kanda, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, T. Koike, K. Matsuda, Y. Matsumoto, K. Miwa, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, T. Nanamura, M. Naruki, S. Ozawa, L. Raux, A. Sakaguchi, H. Sako, S. Sato, T. Shiozaki, K. Shirotori, K. Suzuki, S. Suzuki, M. Tabata, C. d. L. Taille, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, Z. Tsamalaidze, H. Umetsu, M. Ukai, T. O. Yamamoto, K. Yoshimura

    Proceedings of the 5th International Workshop on New Photon-Detectors (PD18)　2019/11/14

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.27.011008 　

  31. Search for Excited State of \(_{\Sigma }^{4}\text{He}\) Hypernucleus in the J-PARC E13 Experiment Peer-reviewed

    Manami Nakagawa, Michelangelo Agnello, Yuya Akazawa, Nobuaki Amano, Kanae Aoki, Elena Botta, Nobuyuki Chiga, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Manami Fujita, Toshiyuki Gogami, Shoichi Hasegawa, Shuhei H. Hayakawa, Tomonari Hayakawa, Ryotaro Honda, Kenji Hosomi, Sanghoon Hwang, Natsumi Ichige, Yudai Ichikawa, Michihiko Ikeda, Ken’ichi Imai, Shigeru Ishimoto, Shunsuke Kanatsuki, Minho Kim, Shinhyung Kim, Shinji Kinbara, Takeshi Koike, Jaeyong Lee, Simonetta Marcello, Koji Miwa, Taejin Moon, Tomofumi Nagae, Sho Nagao, Yoshiyuki Nakada, Yu Ogura, Atsushi Sakaguchi, Hiroyuki Sako, Yuki Sasaki, Susumu Sato, Takehiro Shiozaki, Kotaro Shirotori, Hitoshi Sugimura, Sadami Suto, Shoji Suzuki, Toshiyuki Takahashi, Hirokazu Tamura, Kosuke Tanabe, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Takeshi O. Yamamoto, Yasutaka Yamamoto, Seongbae Yang

    Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)　2019/11/08

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.26.023005 　

  32. Experimental Study of Di-quark Correlation by Charmed Baryon Spectroscopy at J-PARC High-Momentum Secondary Beam Line

    Yusuke Komatsu, Jung-Kun Ahn, Shuhei Ajimura, Takaya Akaishi, Kazuya Aoki, Hidemitsu Asano, Wen-Chen Chang, Ryotaro Honda, Yudai Ichikawa, Takatsugu Ishikawa, Yue Ma, Koji Miwa, Yoshiyuki Miyachi, Yuhei Morino, Kei Nagai, Takashi Nakano, Megumi Naruki, Hiroyuki Noumi, Kyoichiro Ozawa, Fuminori Sakuma, Takahiro Sawada, Kotaro Shirotori, Yorihito Sugaya, Tomonori Takahashi, Kiyoshi Tanida, Natsuki Tomida, Takumi Yamaga, Seongbae Yang

    Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)　2019/11/08

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.26.022029 　

  33. A Σp Scattering Experiment at J-PARC and the Analysis Status Peer-reviewed

    Yoshiyuki Nakada, Jung Keun Ahn, Yuya Akazawa, Takashi Aramaki, Sakiko Ashikaga, Stephane Callier, Nobuyuki Chiga, Sung Wook Choi, Hiroyuki Ekawa, Petr Evtoukhovitch, Norina Fujioka, Manami Fujita, Shoichi Hasegawa, Shuhei Hayakawa, Ryotaro Honda, Suharu Hoshino, Kenji Hosomi, Masaya Ichikawa, Yudai Ichikawa, Masaharu Ieiri, Michihiko Ikeda, Ken’ichi Imai, Yuji Ishikawa, Shigeru Ishimoto, Woo Seung Jung, Honoka Kanauchi, Hiroki Kanda, Byung Min Kang, Hideyuki Kawai, Shin Hyung Kim, Kazuya Kobayashi, Takeshi Koike, Kumpei Matsuda, Yuki Matsumoto, Koji Miwa, Ryohei Nagatomi, Manami Nakagawa, Isamu Nakamura, Takuya Nanamura, Megumi Naruki, Shotaro Ozawa, Ludovic Raux, Atsushi Sakaguchi, Hiroyuki Sako, Susumu Sato, Takehiro Shiozaki, Kotaro Shirotori, Kazuki Suzuki, Shoji Suzuki, Makoto Tabata, Christophe de La Taille, Hitoshi Takahashi, Toshiyuki Takahashi, Tomonori Takahashi, Hirokazu Tamura, Manobu Tanaka, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Hiroo Umetsu, Takeshi O. Yamamoto, Seong Bae Yang, Koji Yoshimura

    Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)　2019/11/08

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.26.023024 　

  34. Study of Y* in Nuclei through C(K−, π+)X Spectrum at 1.8 GeV/c in the J-PARC E05 Experiment Peer-reviewed

    Ryotaro Honda, Jung Keun Ahn, Yuya Akazawa, Kanae Aoki, Elena Botta, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Manami Fujita, Toshiyuki Gogami, Shoichi Hasegawa, Shuhei Hayakawa, Tomonari Hayakawa, Kenji Hosomi, Ken’ichi Imai, Yudai Ichikawa, Wooseung Jung, Shunsuke Kanatsuki, Shinhyung Kim, Sinji Kinbara, Kazuya Kobayashi, Jaeyong Lee, Simonetta Marcello, Koji Miwa, Taejin Moon, Tonofumi Nagae, Yoshiyuki Nakada, Manami Nakagawa, Takuya Nanamura, Megumi Naruki, Atsushi Sakaguchi, Hiroyuki Sako, Susumu Sato, Yuki Sasaki, Kotaro Shirotori, Hitoshi Sugimura, Toshiyuki Takahashi, Hirokazu Tamura, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Takeshi O. Yamamoto

    Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)　2019/11/08

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.26.023014 　

  35. First $\gamma$-ray spectroscopy of an $sd$-shell hypernucleus, $^{19}_{\Lambda}$F Peer-reviewed

    Yang S. B.*, Hasegawa Shoichi, Hayakawa Shuhei*, Hosomi Kenji, Ichikawa Yudai, Imai Kenichi, Sako Hiroyuki, Sato Susumu, Tamura Hirokazu*, Tanida Kiyoshi, Yamamoto Takeshi, 37 of others*

    JPS Conference Proceedings (Internet)　26　023015\_1-023015\_5　2019/11

    DOI： 10.7566/JPSCP.26.023015 　

    ISSN： 2435-3892

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    We performed a gamma-ray spectroscopy of $({}_{\Lambda}^{19}{\rm F})$ at J-PARC Hadron Experimental Facility in 2015. It is the first measurement of $\gamma$ rays emitted from $sd$-shell hypernuclei. In this experiment, we determined the energy spacing between the ground state spin doublet, $3/2^+$ and $1/2^+$ states, as 316 keV. The excitation energies of $5/2^+$ and $1/2^+$ states are also determined to be 895 and 1266 keV, respectively. The energy spacing is found to be well reproduced by shell-model calculations which describe $s$- and $p$-shell $\Lambda$ hypernuclei well. The results show that the present theories of the $\Lambda N$ interaction describe not only the light hypernuclei but also a heavier hypernucleus.

  36. Development of TPC Trigger Hodoscope for J-PARC E42/E45 hadron experiment Peer-reviewed

    Jung W.*, Ahn J. K.*, Hasegawa Shoichi, Hicks K.*, Hwang S.*, Ichikawa Yudai, Kim S.*, Sako Hiroyuki, Sato Susumu, Tanida Kiyoshi

    JPS Conference Proceedings (Internet)　27　011007\_1-011007\_6　2019/11

    DOI： 10.7566/JPSCP.27.011007 　

    ISSN： 2435-3892

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    We have developed HypTPC consists of TPC and the trigger hodoscope for the J-PARC hadron experiments. The TPC Hodoscope has large scintillators of 80 $\times$ 7 $\times$ 1 cm$^3$ to cover the TPC. Especially, we have developed a readout circuit for multiple MPPCs to detect photons generated over a large area of the scintillator. A general methods of applying voltage to multiple MPPCs are parallel and series connections. In the case of parallel connections, a signal has a long tail due to the large sensor capacitance. MEG collaboration used four MPPC segments as a serial connection. However, in the case of a series connection, the requiring bias voltage is very high, and the gain is low. To avoid this problem, we have developed a new individual biasing method with a summing amplifier for stable multiple MPPC readouts. We also made prototype detectors and performed a cosmic-ray test. Brief descriptions of our prototypes and preliminary results of the cosmic-ray test are presented in this article.

  37. High-rate performance of a time projection chamber for an H-dibaryon search experiment at J-PARC Peer-reviewed

    S. H. Kim, Y. Ichikawa, H. Sako, J. K. Ahn, T. Akaishi, S. Ashikaga, S. W. Choi, H. Ekawa, S. Hasegawa, S. Hayakawa, W. S. Jung, B. M. Kang, J. Y. Lee, T. Nanamura, S. Sato, K. Shirotori, K. Suzuki, K. Tanida, S. B. Yang, J. Yoshida

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　940　359-370　2019/10/01

    DOI： 10.1016/j.nima.2019.06.050 　

    ISSN： 0168-9002

  38. Status of J-PARC E07: Systematic study of double strangeness nuclei with hybrid emulsion method

    Junya Yoshida, Keizo Agari, Jung Keun Ahn, Takaya Akaishi, Yuya Akazawa, Sakiko Ashikaga, Be, Bassalleck, Sebastian Bleser, Wonji Choi, Woo Seung Chung, Hiroyuki Ekawa, Yoko Endo, Yuki Fujikawa, Norina Fujioka, Manami Fujita, Ryosuke Goto, Yuncheng Han, Shoichi Hasegawa, Tadashi Hashimoto, Shuhei Hayakawa, Tomonari Hayakawa, Emi Hayata, Kenneth Hicks, Erina Hirose, Masanori Hirose, Ryotaro Honda, Kaoru Hoshino, Suharu Hoshino, Kenji Hosomi, Sang Hoon Hwang, Yudai Ichikawa, Masaya Ichikawa, Masaharu Ieiri, Kenichi Imai, Kento Inaba, Yuji Ishikawa, Abzal Iskendir, Hiroki Ito, Kazuyua Ito, Shunsuke Kanatsuki, Honoka Kanauchi, Ayumi Kasagi, Toshihide Kawai, Min Ho Kim, Shin Hyung Kim, Sung Hyun Kim, Young Jun Kim, Shinji Kinbara, Ryuta Kiuchi, Hidetaka Kobayashi, Kazuya Kobayashi, Takeshi Koike, Ami Koshikawa, Jae Yong Lee, Jong Won Lee, Myeong Jae Lee, Tianli Ma, Shota Matsumoto, Michifumi Minakawa, Koji Miwa, Aung Thu Moe, Tae Jin Moon, Manabu Moritsu, Yuichi Nagase, Yoshiyuki Nakada, Manami Nakagawa, Daisuke Nakashima, Kazuma Nakazawa, Takuya Nanamura, Megumi Naruki, Aung Nay Lin Nyaw, Yu Ogura, Masaki Ohashi, Kenichiro Oue, Shotaro Ozawa, Josef Pochodzalla, Sun Young Ryu, Hiroyuki Sako, Yuki Sasaki, Susumu Sato, Yoshinori Sato, Falk Schupp, Michiko Sekimoto, Koutarou Shiratori, Min Min Soe, Myint Kyaw Soe, Jong Yoon Sohn, Hitoshi Sugimura, Kazuki Suzuki, May Sweet, Hitoshi Takahashi, Toshiyuki Takahashi, Yu Takahashi, Tomoya Takeda, Hirokazu Tamura, Kiyoshi Tanida, Aye Moh Moh Theint, Khin Than Tint, Yuichi Toyama, Mifuyu Ukai

    AIP Conference Proceedings　2130　2019/07/25

    DOI： 10.1063/1.5118384 　

    ISSN： 0094-243X

    eISSN： 1551-7616

  39. Σp scattering experiment at J-PARC - Results of commissioning run

    K. Miwa, J. K. Ahn, Y. Akazawa, T. Aramaki, S. Ashikaga, S. Callier, N. Chiga, S. W. Choi, H. Ekawa, P. Evtoukhovitch, N. Fujioka, M. Fujita, S. Hasegawa, S. Hayakawa, R. Honda, S. Hoshino, K. Hosomi, M. Ichikawa, Y. Ichikawa, M. Ieiri, M. Ikeda, K. Imai, Y. Ishikawa, S. Ishimoto, W. S. Jung, H. Kanauchi, H. Kanda, B. M. Kang, H. Kawai, S. H. Kim, K. Kobayashi, T. Koike, K. Matsuda, Y. Matsumoto, R. Nagatomi, Y. Nakada, M. Nakagawa, I. Nakamura, T. Nanamura, M. Naruki, S. Ozawa, L. Raux, A. Sakaguchi, H. Sako, S. Sato, T. Shiozaki, K. Shirotori, K. Suzuki, S. Suzuki, M. Tabata, C. D.L. Taille, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, Z. Tsamalaidze, H. Umetsu, M. Ukai, T. O. Yamamoto, K. Yoshimura

    AIP Conference Proceedings　2130　2019/07

    DOI： 10.1063/1.5118374 　

    ISSN： 0094-243X

    eISSN： 1551-7616

  40. Gamma-ray spectroscopy of single Λ-hypernuclei at J-PARC: Results and perspective Peer-reviewed

    T. Koike, M. Agnello, J. K. Ahn, Y. Akazawa, N. Amano, K. Aoki, E. Botta, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, M. Fujita, T. Gogami, S. Hasegawa, S. H. Hayakawa, T. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, N. Ichige, Y. Ichikawa, M. Ikeda, K. Imai, S. Ishimoto, S. Kanatsuki, M. H. Kim, S. H. Kim, S. Kinbara, K. Kobayashi, J. Y. Lee, S. Marcello, K. Miwa, T. J. Moon, T. Nagae, S. Nagao, Y. Nakada, M. Nakagawa, Y. Ogura, A. Sakaguchi, H. Sako, Y. Sasaki, S. Sato, T. Shiozaki, K. Shirotori, H. Sugimura, S. Suto, S. Suzuki, T. Takahashi, H. Tamura, K. Tanabe, K. Tanida, Y. Togawa, Z. Tsamalaidze, M. Ukai, T. F. Wang, T. O. Yamamoto, S. B. Yang

    AIP Conference Proceedings　2130　020011　2019/07

    DOI： 10.1063/1.5118379 　

    ISSN： 0094-243X

    eISSN： 1551-7616

  41. Observation of a Ξ bound state in the 12C(K−, K+) reaction at 1.8 GeV/c Peer-reviewed

    Tomofumi Nagae, Shunsuke Kanatsuki, Yudai Ichikawa, Ryotaro Honda

    AIP Conf.Proc.　2130　(1)　020015　2019/07

  42. K̄ and nucleus system studied by 12C(K−, p) spectrum Peer-reviewed

    Yudai Ichikawa, Junko Yamagata-Sekihara, Shunsuke Kanatsuki, Tomofumi Nagae, Ryotaro Honda

    AIP Conf.Proc.　2130　(1)　040017　2019/07

  43. Write-ups for workshop on the project for the hadron experimental facility of J-PARC, Partial collection of LOIs at the extended hadron hall and the related topics

    Hadron Hall Users' Association, P. Achenbach, J. K. Ahn, S. Ajimura, T. Akaishi, Y. Akaishi, W. Ikegami Andersson, K. Aoki, H. Asano, S. Bleser, E. Botta, M. Bölting, WC. Chang, A. Feliciello, H. Fujioka, M. Hassanvand, R. Honda, Y. Ichikawa, T. Ishikawa, K. Itahashi, Y. Komatsu, K. Miwa, Y. Miyachi, Y. Morino, T. Nakano, S. N. Nakamura, M. Naruki, H. Noumi, H. Ohnishi, S. Okada, K. Ozawa, J. Pochodzalla, H. Sako, F. Sakuma, T. Sawada, F. Schupp, K. Shirotori, M. Steinen, Y. Sugaya, K. Suzuki, H. Takahashi, T. Takahashi, T. N. Takahashi, K. Tanaka, N. Tomida, M. Ukai, T. Yamaga, T. Yamamoto, T. Yamazaki, S. Yang, M. Yue, J-PARC KOTO Collaboration

    2019/06/05

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    This write-up document is a summary of International workshop on the project for the extended hadron experimental facility which was held from March 26 to 28, 2018 at KEK Tokai Campus. This document is a collection of Letter Of Intents (LOIs) related to the proposed beam lines in the extended hadron experimental facility at J-PARC.

  44. J-PARC-HI Collaboration

    J. K. Ahn, Y. Akamatsu, M. Asakawa, S. Ashikaga, O. Busch, M. Chiu, T. Chujo, P. Cirkovic, T. Csörgő, G. David, D. Devetak, M. Dordevic, S. Esumi, H. Fujii, K. Fukushima, P. Garg, T. Gunji, T. Hachiya, H. Hamagaki, H. Harada, M. Harada, S. Hasegawa, T. Hatsuda, T. Hirano, B. Hong, H. Hotchi, S. H. Hwang, Y. Ichikawa, T. Ichisawa, K. Imai, M. Inaba, K. Itakura, J. Kamiya, M. Kaneta, H. Kato, S. Kato, B. C. Kim, E. J. Kim, M. Kinsho, M. Kitazawa, A. Kovalenko, Y. Liu, X. Luo, T. Maruyama, Y. Miake, J. Milosevic, D. Mishra, K. Morita, K. Murase, L. Nadjdjerdj, S. Nagamiya, A. Nakamura, T. Nakamura, Y. Nara, M. Naruki, K. Nishio, C. Nonaka, T. Nonaka, M. Ogino, A. Ohnishi, M. Oka, A. Okabe, M. Okamura, K. Oyama, K. Ozawa, P. K. Saha, T. Saito, A. Sakaguchi, T. Sakaguchi, S. Sakai, H. Sako, K. Sato, S. Sato, S. Sawada, K. Shigaki, S. Shimansky, M. Shimomura, Y. Shobuda, M. Stojanovic, H. Sugimura, Y. Takeuchi, F. Tamura, H. Tamura, J. Tamura, K. H. Tanaka, Y. Tanaka, N. Tani, K. Tanida, Y. Watanabe, N. Xu, M. Yamamoto, S. Yokkaichi, I. K. Yoo, M. Yoshimoto

    Nuclear Physics A　982　1038-1039　2019/02

    DOI： 10.1016/S0375-9474(18)30507-4 　

    ISSN： 0375-9474

  45. Study on the Method of Identifying Λ by π-p → ΛK0 Reaction for Λp Scattering Experiment

    Sakao T., Miwa K., Honda R., Fujioka N., Kanauchi H., Ishikawa Y., Tamura H., Matsuda K., Aramaki T., Kajikawa S., Nagao S., Fujita M., Ikeda M., Matsumoto Y., Ozawa S., Shiozaki T., Umetsu H., Rogers T., Nakada Y., Hoshino S., Nagatomi R., Kobayashi K., Shirotori K., Nanamura T., Ashikaga S., Ichikawa M., Suzuki K., Gogami T., Harada T., Takahashi T., Ukai M., Suzuki S., Akazawa Y., Ieiri M., Ishimoto S., Ichikawa Y., Tanida K., Yamamoto T., Hayakawa S., Yoshida J., Ekawa H., Kim S. H., Kang B. M., Jung W. S., Choi S. W., J-PARC E40

    Meeting Abstracts of the Physical Society of Japan　74.2　306-306　2019

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.74.2.0_306 　

    eISSN： 2189-0803

  46. Analysis of Sigma beam intensity in Sigma proton scattering experiment (J-PARC E40)

    Matsuda K., Miwa K., Honda R., Fujioka N., Kanauchi H., Ishikawa Y., Tamura H., Aramaki T., Sakao T., Kajikawa S., Nagao S., Fujita M., Ikeda M., Matsumoto Y., Ozawa S., Shiozaki T., Umetsu H., Rogers T., Nakada Y., Hoshino S., Nagatomi R., Kobayashi K., Shirotori K., Nanamura T., Ashikaga S., Ichikawa M., Suzuki K., Gogami T., Harada T., Takahashi T., Ukai M., Suzuki S., Akazawa Y., Ieiri M., Ishimoto S., Ichikawa Y., Tanida K., Yamamoto T., Hayakawa S., Yoshida J., Ekawa H., Kim S. H., Kang B. M., Jung W. S., Choi S. W., for the J-PARC E40

    Meeting Abstracts of the Physical Society of Japan　74.2　303-303　2019

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.74.2.0_303 　

    eISSN： 2189-0803

  47. Analysis status of Σ+p Scattering events in the J-PARC E40 experiment

    Nanamura T., Miwa K., Honda R., Fujioka N., Kanauchi H., Ishikawa Y., Tamura H., Matsuda K., Aramaki T., Sakao T., Kajikawa S., Nagao S., Fujita M., Ikeda M., Matsumoto Y., Ozawa S., Shiozaki T., Umetsu H., Anya Rogers, Ashikaga S., Ichikawa M., Suzuki K., Gogami T., Harada T., Ichikawa Y., Tanida K., Yamamoto T., Hayakawa S., Yoshida J., Nakada Y., Hoshino S., Nagatomi R., Kobayashi K., Shirotori K., Takahashi T., Ukai M., Suzuki S., Akazawa Y., Ieiri M., Ishimoto S., Ekawa H., Kim S. H., Kang B. M., Jung W. S., Choi S. W., J-PARC E40 collaboration

    Meeting Abstracts of the Physical Society of Japan　74.2　305-305　2019

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.74.2.0_305 　

    eISSN： 2189-0803

  48. (K)over-bar and nucleus system studied by C-12(K-, p) spectrum

    Yudai Ichikawa, Junko Yamagata-Sekihara, Jung Keun Ahn, Yuya Akazawa, Kanae Aoki, Elena Bottta, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Manami Fujita, Toshiyuki Gogami, Shoichi Hasegawa, Tomoyuki Hasegawa, Shuhei Hayakawa, Tomonori Hayakawa, Satoru Hirenzaki, Ryotaro Honda, Kenji Hosomi, Ken'ichi Imai, Wooseung Jung, Shunsuke Kanatsuki, Shinhyung Kim, Sinji Kinbara, Kazuya Kobayashi, Jaeyong Lee, Simonetta Marcello, Koji Miwa, Taejin Moon, Tomofumi Nagae, Yoshiyuki Nakada, Manami Nakagawa, Takuya Nanamura, Megumi Naruki, Atsushi Sakaguchi, Hiroyuki Sako, Susumu Sato, Yuki Sasaki, Kotaro Shirotori, Hitoshi Sugimura, Toshiyuki Takahashi, Hirokazu Tamura, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Takeshi. O. Yamamoto

    13TH INTERNATIONAL CONFERENCE ON HYPERNUCLEAR AND STRANGE PARTICLE PHYSICS (HYP2018)　2130　2019

    DOI： 10.1063/1.5118414 　

    ISSN： 0094-243X

  49. Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment Peer-reviewed

    H. Ekawa, K. Agari, J. K. Ahn, T. Akaishi, Y. Akazawa, S. Ashikaga, B. Bassalleck, S. Bleser, Y. Endo, Y. Fujikawa, N. Fujioka, M. Fujita, R. Goto, Y. Han, S. Hasegawa, T. Hashimoto, S. H. Hayakawa, T. Hayakawa, E. Hayata, K. Hicks, E. Hirose, M. Hirose, R. Honda, K. Hoshino, S. Hoshino, K. Hosomi, S. H. Hwang, Y. Ichikawa, M. Ichikawa, M. Ieiri, K. Imai, K. Inaba, Y. Ishikawa, A. Iskendir, H. Ito, K. Ito, W. S. Jung, S. Kanatsuki, H. Kanauchi, A. Kasagi, T. Kawai, M. H. Kim, S. H. Kim, S. Kinbara, R. Kiuchi, H. Kobayashi, K. Kobayashi, T. Koike, A. Koshikawa, J. Y. Lee, J. W. Lee, T. L. Ma, S. Y. Matsumoto, M. Minakawa, K. Miwa, A. T. Moe, T. J. Moon, M. Moritsu, Y. Nagase, Y. Nakada, M. Nakagawa, D. Nakashima, K. Nakazawa, T. Nanamura, M. Naruki, A. N.L. Nyaw, Y. Ogura, M. Ohashi, K. Oue, S. Ozawa, J. Pochodzalla, S. Y. Ryu, H. Sako, Y. Sasaki, S. Sato, Y. Sato, F. Schupp, K. Shirotori, M. M. Soe, M. K. Soe, J. Y. Sohn, H. Sugimura, K. N. Suzuki, H. Takahashi, T. Takahashi, Y. Takahashi, T. Takeda, H. Tamura, K. Tanida, A. M.M. Theint, K. T. Tint, Y. Toyama, M. Ukai, E. Umezaki, T. Watabe, K. Watanabe, T. O. Yamamoto, S. B. Yang, C. S. Yoon, J. Yoshida

    Progress of Theoretical and Experimental Physics　2019　(21)　021D02　2018/11

    DOI： 10.1093/ptep/pty149 　

    eISSN： 2050-3911

  50. First Determination of the Level Structure of an sd -Shell Hypernucleus, F Λ19 Peer-reviewed

    S. B. Yang, J. K. Ahn, Y. Akazawa, K. Aoki, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, M. Fujita, S. Hasegawa, S. Hayakawa, T. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, N. Ichige, Y. Ichikawa, M. Ikeda, K. Imai, S. Ishimoto, S. Kanatsuki, S. H. Kim, S. Kinbara, K. Kobayashi, T. Koike, J. Y. Lee, K. Miwa, T. J. Moon, T. Nagae, Y. Nakada, M. Nakagawa, Y. Ogura, A. Sakaguchi, H. Sako, Y. Sasaki, S. Sato, K. Shirotori, H. Sugimura, S. Suto, S. Suzuki, T. Takahashi, H. Tamura, K. Tanida, Y. Togawa, Z. Tsamalaidze, M. Ukai, T. F. Wang, T. O. Yamamoto

    Physical Review Letters　120　(13)　132505\_1-132505\_5　2018/03/29

    DOI： 10.1103/PhysRevLett.120.132505 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  51. Development of PID method in nuclear emulsion

    S. Kinbara, H. Ekawa, T. Fujita, S. Hayakawa, S. H. Hwang, Y. Ichikawa, K. Imamura, H. Itoh, H. Kobayashi, R. Murai, K. Nakazawa, M. K. Soe, A. Takamine, A. M. M. Theint, H. Ueno, J. Yoshida

    JPS Conf. Proc.　17　032002-1-032002-4　2017/12

    DOI： 10.7566/JPSCP.17.032002 　

  52. Spectroscopy of Nuclei with Multi-Strangeness by Using New S-2S Spectrometer at J-PARC Peer-reviewed

    Toshiyuki Gogami, Jung Keun Ahn, Yuya Akazawa, Nobuaki Amano, Kanae Aoki, Elena Botta, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Hiroyuki Fujioka, Manami Fujita, Shoichi Hasegawa, Tomoyuki Hasegawa, Shuhei Hayakawa, Tomonari Hayakawa, Erina Hirose, Ryotaro Honda, Kenji Hosomi, Kenichi Imai, Yudai Ichikawa, Wooseung Jung, Shunsuke Kanatsuki, Seigo Kato, Shinhyung Kim, Shinji Kinbara, Kazuya Kobayashi, Jaeyong Lee, Simonetta Marcello, Koji Miwa, Taejin Moon, Manabu Moritsu, Tomofumi Nagae, Yoshiyuki Nakada, Manami Nakagawa, Takuya Nanamura, Megumi Naruki, Atsushi Sakaguchi, Hiroyuki Sako, Yuki Sasaki, Susumu Sato, Kotaro Shirotori, Hitoshi Sugimura, Hitoshi Takahashi, Toshiyuki Takahashi, Kohei Takenaka, Hirokazu Tamura, Kiyoshi Tanida, Zviadi Tsamalaidze, Mifuyu Ukai, Takeshi O. Yamamoto

    JPS Conference Proceedings　18　011031 1-6　2017/11

    DOI： 10.7566/JPSCP.18.011031 　

  53. The First gamma-ray spectroscopic study of $sd$-shell hypernucleus, $^{19}_{\Lambda}$F Peer-reviewed

    Yang S. B.*, Ekawa Hiroyuki, Hasegawa Shoichi, Hayakawa Shuhei, Hosomi Kenji, Hwang S., Ichikawa Yudai, Imai Kenichi, Sako Hiroyuki, Sato Susumu, Sugimura Hitoshi, Tamura Hirokazu, Tanida Kiyoshi, 34 of others*

    JPS Conference Proceedings (Internet)　17　012004\_1-012004\_4　2017/07

    DOI： 10.7566/JPSCP.17.012004 　

    ISSN： 2435-3892

    More details Close

    The first $\gamma$-ray spectroscopy of $sd$-shell hypernucleus, $^{19}_{\Lambda}$F, is performed in June, 2015 at the J-PARC K1.8 beam line (J-PARC E13). Precise energy levels of $^{19}_{\Lambda}$F can be revealed by measured $\gamma$ rays in this experiment. Especially, the strength of $\Lambda N$ spin-spin interaction in $sd$-shell hypernucleus is obtained through the energy spacing of the ground-state doublet of the hypernucleus. By comparing its strength between the $s$, $p$, and $sd$-shell hypernuclei, a radial dependence $\Lambda N$ interaction is investigated. The hypernucleus is produced through the $(K^-,\pi^-)$ reaction with the beam momentum of 1.8 GeV/c. In very preliminary results, we observed two $\gamma$ rays, and their energies are $315.8 \pm 0.4$ keV and $ 895.3 \pm 0.3$ keV where the uncertainties are only statistical.

  54. Search for Excited State of Σ Hypernucleus in the J-PARC E13 Experiment Peer-reviewed

    M. Nakagawa, M. Agnello, Y. Akazawa, N. Amano, K. Aoki, E. Botta, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, M. Fujita, T. Gogami, S. Hasegawa, S. H. Hayakawa, T. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, N. Ichige, Y. Ichikawa, M. Ikeda, K. Imai, S. Ishimoto, S. Kanatsuki, M. H. Kim, S. H. Kim, S. Kinbara, T. Koike, J. Y. Lee, S. Marcello, K. Miwa, T. Moon, T. Nagae, S. Nagao, Y. Nakada, Y. Ogura, A. Sakaguchi, H. Sako, Y. Sasaki, S. Sato, T. Shiozaki, K. Shirotori, H. Sugimura, S. Suto, S. Suzuki, T. Takahashi, H. Tamura, K. Tanabe, K. Tanida, Z. Tsamalaidze, M. Ukai, Y. Yamamoto, S. B. Yang

    Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)　17　012009 1-4　2017/07

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/JPSCP.17.012009 　

  55. The First Gamma-ray Spectroscopic Study of sd-shell Hypernucleus, 19LambdaF

    S.B. Yang, Y. Akazawa, K. Aoki, N. Chiga, H. Ekawa, A. Feliciello, M. Fujita, S. Hasegawa, S. Hayakawa, T. Hayakawa, R. Honda, K. Hosomi, S.H. Hwang, N. Ichige, Y. Ichikawa, M. Ikeda, K. Imai, S. Ishimoto, S. Kanatsuki, S. H. Kim, S. Kinbara, K. Kobayashi, T. Koike, J.Y. Lee, K. Miwa, T. J. Moon, T. Nagae, Y. Nakada, M. Nakagawa, Y. Ogura, A. Sakaguchi, H. Sako, Y. Sasaki, S. Sato, K. Shirotori, S. Suto, H.Sugimura, S.Suzuki, T.Takahashi, H.Tamura, K.Tanida, Y.Togawa, M.Ukai, T.F. Wang, T.O. Yamamoto

    JPS Conf.Proc.　17　012004　2017/07

  56. $\gamma$-ray spectroscopy of hypernuclei; Recent results and prospect at J-PARC Peer-reviewed

    Tamura, Hirokazu, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Hwang, S, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, J-PARC E, Collaboration, of others

    JPS Conference Proceedings (Internet)　17　011004\_1-011004\_11　2017/07

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/JPSCP.17.011004 　

    More details Close

    The present status and future prospects of precision $\gamma$-ray spectroscopy of $\Lambda$ hypernuclei are described. A new experiment (J-PARC E13) has been performed at the J-PARC K1.8 line employing a newly-developed germanium (Ge) detector array, Hyperball-J, via the $(K^-,\pi^-)$ reaction on $^4$He and $^{19}$F targets. This is the first study of $s$-shell and $sd$-shell $\Lambda$ hypernuclei with Ge detectors. The $^4$He target spectrum exhibited a $\gamma$-ray peak of $^4_{\Lambda}{\rm He}(1^+\to 0^+)$ at $1.406 \pm 0.002 \pm 0.002$ MeV. Compared with the energy ($1.09 \pm 0.02$ MeV) of the corresponding transition for the mirror hypernucleus, $^4_{\Lambda}{\rm H}(1^+\to 0^+)$, the present result clearly indicates a large charge symmetry breaking (CSB) effect. This decisive data for CSB allows a stringent test of baryon-baryon interaction models. As for the $^{19}$F target run, a preliminary spectrum shows several $\gamma$-ray peaks assigned to $^{19}_{\Lambda}{\rm F}$ transitions. Future plans of $\gamma$-ray spectroscopy are also discussed.

  57. Search For A$\Xi$ Bound State In The $^{12}$C$(K^-,K^+)X$ Reaction At 1.8 GeV/$c$ in J-PARC Peer-reviewed

    Tomofumi Nagae, S. Kanatsuki, T. Gogami, H. Ekawa, T. Nanamura, M. Naruki, S. Hasegawa, K. Hosomi, Y. Ichikawa, K. Imai, H. Sako, S. Sato, H. Sugimura, K. Tanida, K. Kobayashi, S.H. Hayakawa, T. Hayakawa, R. Honda, Y. Nakada, M. Nakagawa, A. Sakaguchi, Y. Akazawa, M. Fujita, K. Miwa, Y. Sasaki, H. Tamura, T.O. Yamamoto, K. Aoki, T. Takahashi, M. Ukai, J.K. Ahn, W. Jung, S.H. Kim, E. Botta, A. Feliciello, S. Marcello, P. Evtoukhovitch, Z. Tsamalaidze, J.Y. Lee, T. Moon, S. Kimbara, T. Hasegawa, K. Shirotori

    Proceedings of Science　INPC2016　038 1-6　2017/05

    DOI： 10.22323/1.281.0038 　

  58. Baryon spectroscopy in $(\pi,2\pi)$ reactions with 10$^{6}$Hz pion beams at J-PARC Peer-reviewed

    Sako, Hiroyuki, Hasegawa, Shoichi, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Hicks, K, Ahn, J. K, Kim, S. H, Lee, J. W, Hwang, S. H

    Proceedings of Science (Internet)　5　2017/05

    More details Close

    Although baryon resonances have been studied for a long time, our knowledge on their properties are still limited. Recently a Dynamical-Couple Channel (DCC) model shows there are significant contributions of $(\pi,2\pi)$ reactions to these baryon resonances. However, there are only 240 thousand events of $(\pi, 2\pi)$ reaction data measured in 1970&#039;s. Thus, we proposed an experiment E45 to study baryon resonances in $(\pi,2\pi)$ reaction utilizing $10^6$ Hz $\pi$ beams at J-PARC. We aim at clarifying most of baryon mass levels. We measure these reactions in a large acceptance Time Projection Chamber inside a Helmholtz dipole magnet. We will measure these reactions in small momentum steps over a large beam momentum range and perform partial wave analysis to extract properties of each resonance. In this presentation, we will show the experimental design, expected results in simulations, and the status of the detectors.

  59. Study of the $\overline{K}$-nucleus interaction by using the $^{12}$C(K$^{-}$, p) reaction at J-PARC Peer-reviewed

    Ichikawa, Yudai, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Imai, Kenichi, Kimbara, Shinji, Nakada, Yoshiyuki, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, of others

    JPS Conference Proceedings (Internet)　13　020007\_1-020007\_5　2017/02

    DOI： 10.7566/JPSCP.13.020007 　

    More details Close

    An interaction between K$^{bar}$ and nucleus is studied by using the X-ray from the kaonic atoms for a long time. However, it is difficult to determine the K$^{bar}$-nucleus interaction by using only kaonic-atoms data because the value of shift and width of the X-ray depend not only the potential depth but also the type of theoretical model. Thus, we study the $\overline{K}$-nucleus interaction by comparing an observed missing-mass spectrum of the $^{12}$C(K$^{-}$, p) reaction with the DWIA calculation. Such a study has already reported from KEK-E548 experiment. However, their experiment is not enough to determine these interaction because they were pointed out about the experimental condition. Thus, we performed the further experiment to take the real spectrum of $^{12}$C(K$^{-}$, p) reaction at J-PARC.

  60. GEM based TPC for the high intensity beam at J-PARC

    Shin Hyung Kim, Jung Keun Ahn, Hiroyuki Sako, Yudai Ichikawa, Hitoshi Sugimura

    Proceedings of Science　310　2017

    eISSN： 1824-8039

  61. Isotope identification in nuclear emulsion plate for double-hypernuclear study (isotope track-angle dependence International-coauthorship Peer-reviewed

    R. Murai, S. Kinbara, H. Ekawa, T. Fujita, S. Hayakawa, S.H. Hwang, Y. Ichikawa, K. Imamura, H. Itoh, H. Kobayashi, M.K.Soe, A. Takamine, A.M.M.Theint, H. Ueno, J. Yoshida, K. Nakazawa

    RIKEN Accel. Prog. Rep.　50　214　2017

  62. Missing-mass spectroscopy with the Li 6 (π-,K+)X reaction to search for H Λ6 Peer-reviewed

    Honda, R., Agnello, M., Ahn, J.K., Ajimura, S., Akazawa, Y., Amano, N., Aoki, K., Bhang, H.C., Chiga, N., Endo, M., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Fukuda, T., Hasegawa, S., Hayakawa, S.H., Hosomi, K., Hwang, S.H., Ichikawa, Y., Igarashi, Y., Imai, K., Ishibashi, N., Iwasaki, R., Joo, C.W., Kiuchi, R., Lee, J.K., Lee, J.Y., Matsuda, K., Matsumoto, Y., Matsuoka, K., Miwa, K., Mizoi, Y., Moritsu, M., Nagae, T., Nagamiya, S., Nakagawa, M., Naruki, M., Noumi, H., Ota, R., Roy, B.J., Saha, P.K., Sakaguchi, A., Sako, H., Samanta, C., Samoilov, V., Sasaki, Y., Sato, S., Sekimoto, M., Shimizu, Y., Shiozaki, T., Shirotori, K., Soyama, T., Sugimura, H., Takahashi, T., Takahashi, T.N., Tamura, H., Tanabe, K., Tanaka, T., Tanida, K., Tokiyasu, A.O., Tsamalaidze, Z., Ukai, M., Yamamoto, T.O., Yamamoto, Y., Yang, S.B., Yoshida, K.

    Physical Review C　96　(1)　014005\_1-014005\_23　2017

    DOI： 10.1103/PhysRevC.96.014005 　

  63. Studies of high density baryon matter with high intensity heavy-ion beams at J-PARC Peer-reviewed

    H. Sako, H. Harada, T. Sakaguchi, T. Chujo, S. Esumi, T. Gunji, S. Hasegawa, S. H. Hwang, Y. Ichikawa, K. Imai, K. Itakura, M. Kaneta, B. C. Kim, M. Kinsho, M. Kitazawa, Y. Liu, H. Masui, S. Nagamiya, K. Nishio, M. Okamura, K. Oyama, K. Ozawa, P. K. Saha, A. Sakaguehi, S. Sato, K. Shigaki, H. Sugimura, K. Tanida, J. Tamura, H. Tamura, Y. Nara, T. R. Saito

    NUCLEAR PHYSICS A　956　850-853　2016/12

    DOI： 10.1016/j.nuclphysa.2016.03.030 　

    ISSN： 0375-9474

    eISSN： 1873-1554

  64. 21aAW-11 Study of the K^<bar>-nucleus interaction by using the C(K^-,p) reaction (2)

    Ichikawa Yudai, J-PARC E collaboration

    Meeting Abstracts of the Physical Society of Japan　71　361-361　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_361 　

    ISSN： 2189-079X

  65. π中間子ビームを用いたストレンジダイバリオンの研究

    市川 裕大

    日本物理学会講演概要集　71　231-231　2016

    Publisher: 一般社団法人 日本物理学会

    DOI： 10.11316/jpsgaiyo.71.2.0_231 　

  66. Isotope identification in nuclear emulsion plate for double-hypernuclear study International-coauthorship Peer-reviewed

    S. Kinbara, H. Ekawa, T. Fujita, S. Hayakawa, S.H. Hwang, Y. Ichikawa, K. Imamura, H. Itoh, H. Kobayashi, R. Murai, K. Nakazawa, M.K.Soe, A. Takamine, A.M.M. Theint, H. Ueno, J. Yoshida

    RIKEN Accelerator Progress Report　49　56　2016

  67. New stage of S=-2 hypernuclear study opened with a new high-resolution spectrometer

    Shunsuke Kanatsuki, N. Amano, H. Ekawa, T. Nanamura, T. Nagae, K. Takenaka, T. Gogami, M. Moritsu, E. Hirose, H. Takahashi, T. Takahashi, S. Kato, Y. Ichikawa

    Proceedings of Science　2016-September　2016/01/01

  68. Observation of Ξ bound states in the 12C(K-,K+)X reaction at 1.8 GeV/c in J-PARC Peer-reviewed

    T. Nagae, S. Kanatsuki, T. Gogami, H. Ekawa, T. Nanamura, M. Naruki, S. Hasegawa, K. Hosomi, Y. Ichikawa, K. Imai, H. Sako, S. Sato, H. Sugimura, K. Tanida, K. Kobayashi, S. H. Hayakawa, T. Hayakawa, R. Honda, Y. Nakada, M. Nakagawa, A. Sakaguchi, Y. Akazawa, M. Fujita, K. Miwa, Y. Sasaki, H. Tamura, T. O. Yamamoto, K. Aoki, T. Takahashi, M. Ukai, J. K. Ahn, W. Jung, S. H. Kim, E. Botta, A. Feliciello, S. Marcello, P. Evtoukhovitch, Z. Tsamalaidze, J. Y. Lee, T. Moon, S. Kimbara, T. Hasegawa, K. Shirotori

    Proceedings of Science　2016-September　7　2016

    eISSN： 1824-8039

  69. Observation of Spin-Dependent Charge Symmetry Breaking in Lambda N Interaction: Gamma-Ray Spectroscopy of He-4(Lambda) Peer-reviewed

    T. O. Yamamoto, M. Agnello, Y. Akazawa, N. Amano, K. Aoki, E. Botta, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, M. Fujita, T. Gogami, S. Hasegawa, S. H. Hayakawa, T. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, N. Ichige, Y. Ichikawa, M. Ikeda, K. Imai, S. Ishimoto, S. Kanatsuki, M. H. Kim, S. H. Kim, S. Kinbara, T. Koike, J. Y. Lee, S. Marcello, K. Miwa, T. Moon, T. Nagae, S. Nagao, Y. Nakada, M. Nakagawa, Y. Ogura, A. Sakaguchi, H. Sako, Y. Sasaki, S. Sato, T. Shiozaki, K. Shirotori, H. Sugimura, S. Suto, S. Suzuki, T. Takahashi, H. Tamura, K. Tanabe, K. Tanida, Z. Tsamalaidze, M. Ukai, Y. Yamamoto, S. B. Yang

    PHYSICAL REVIEW LETTERS　115　(22)　222501\_1-222501\_5　2015/11

    DOI： 10.1103/PhysRevLett.115.222501 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  70. Measurement of 3-Body Hadronic Reactions with HypTPC at J-PARC Peer-reviewed

    S. Hwang, J.K. Ahn, B. Bassalleck, H. Fujioka, L. Guo, Y. Han, S. Hasegawa, K. Hicks, R. Honda, K. Hosomi, Y. Ichikawa, M. Ieiri, K. Imai, M.H. Kim, S.H. Kim, S.H. Kim, J. Lee, H.S. Lee, I. J. Lugendo, K. Miwa, T. Moon, M. Niiyama, K. Ozawa, J.B. Park, S.Y. Ryu, H. Sako, S. Sato, H. Sugimura, M. Sumihama, K. Shirotori, H. Takahashi, T. Takahashi, K. Tanida

    JPS Conf.Proc.　8　022008　2015/09

  71. J-PARC E27 experiment to search for a $K^{-}pp$ bound state Peer-reviewed

    Ichikawa, Yudai, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, of others

    JPS Conference Proceedings (Internet)　8　021020\_1-021020\_7　2015/09

    DOI： 10.7566/JPSCP.8.021020 　

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    We have carried out an experimental search for the simplest kaonic nucleus, $K^{-}pp$, by using the $d(\pi^{+},K^{+})$ reaction at $p$ = 1.69 GeV/$c$. The differential cross section of this reaction with covering a wide missing-mass range from the $\Lambda$ production threshold to the $\Lambda$(1405)/$\Sigma$(1385) region has been measured for the first time. The inclusive missing-mass shape of the $\Lambda$ and $\Sigma$ production region was understood with a simple quasi-free picture except for an enhancement at 2.13 GeV/$c^{2}$ due to a $\Sigma N$ cusp. An obtained peak attributed to $Y^{*}$ production was significantly shifted to the low mass side compared with the simulation by -24 MeV/$c^{2}$.

  72. J-PARC E19 experiment; Pentaquark $\Theta^+$ search in hadronic reaction at J-PARC Peer-reviewed

    Takahashi, Tomonori, Ekawa, Hiroyuki, Hayakawa, Shuhei, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, J-PARC E, Collaboration, of others

    JPS Conference Proceedings (Internet)　8　022011\_1-022011\_6　2015/09

    DOI： 10.7566/JPSCP.8.022011 　

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    A search for the $\Theta^+$ pentaquark in the $\pi^-p \to K^-X$ reaction was performed at the J-PARC Hadron Facility. Two data samples were collected in 2010 and 2012 at $\pi^-$ beam momenta of 1.92 and 2.0 GeV/$c$, respectively. No peak structure was observed in the missing mass spectra obtained from either data set. The upper limit for the production cross section averaged over the scattering-angle range of $2^{\circ}$ to $15^{\circ}$ in the laboratory frame was found to be 0.28 $\mu$b/sr. The decay width of the $\Theta^+$ can be directly connected to the production cross section through a theoretical calculation using an effective Lagrangian. The estimated upper limits of the width were 0.41 and 2.8 MeV for the spin-parities of $1/2^+$ and $1/2^-$, respectively.

  73. Study of $\Lambda N$ interaction via the $\gamma$-ray spectroscopy of $^4_{\Lambda}$He and $^{19}_{\Lambda}$F (E13-1st) Peer-reviewed

    Yamamoto T. O.*, Ekawa Hiroyuki, Hasegawa Shoichi, Hayakawa Shuhei, Hosomi Kenji, Ichikawa Yudai, Imai Kenichi, Sako Hiroyuki, Sato Susumu, Sugimura Hitoshi, Tanida Kiyoshi, 39 of others*

    JPS Conference Proceedings (Internet)　8　021017\_1-021017\_6　2015/09

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/JPSCP.8.021017 　

    ISSN： 2435-3892

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    A $\gamma$-ray spectroscopy experiment via the $(K^-, \pi^-)$ reaction (J-PARC E13-1st) will be performed at the J-PARC Hadron Experimental Facility using a newly developed Ge detector array, Hyperball-J. Spin-dependent $\Lambda N$ interactions will be studied through the precise measurement of the structure of hypernuclei, $^4_{\Lambda}$He and $^{19}_{\Lambda}$F. In May 2013, commissioning of whole detector system was carried out and calibration data were taken. In particular, production cross sections of $\Sigma^+$ and $^{12}_{\Lambda}$C via the $(K^-, \pi^-)$ reaction on the CH$_2$ target for $p_K = 1.5$ and 1.8 GeV/$c$ were obtained.

  74. Measurement of the $\Lambda$ spin-flip $B(M1)$ value in hypernuclei Peer-reviewed

    Sasaki, Yuki, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, of others

    JPS Conference Proceedings (Internet)　8　022013\_1-022013\_4　2015/09

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/JPSCP.8.022013 　

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    A hypernuclear $\gamma$-ray spectroscopy experiment (E13) will be performed using $K^-$ beam at the K1.8 beam line of the J-PARC Hadron Experimental Facility in 2015. In this experiment, we will determine the $B(M1)$ value of the $\Lambda$ spin-flip transition of the ground state doublet in $^{19}_{\Lambda}F$ to investigate the magnetic moment of a $\Lambda$ hyperon in nuclei. In order to check the performance of the whole spectrometer system of E13, a commissioning run was performed at the K1.8 beam line in 2013. We confirmed that the E13 setup is almost ready for the next beam time in 2015. In particular, new detectors for suppressing events from the two main $K^-$ decay modes in the on-line and off-line analyses are installed. As a result, the signal to noise ratio of $\gamma$ spectra is drastically improved, and the sensitivity to the $B(M1)$ measurement is expected to increase.

  75. Searching for the H-Dibaryon in J-PARC with a large acceptance hyperon spectrometer Peer-reviewed

    Han, Y, Hasegawa, Shoichi, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, J-PARC E, Collaboration, of others

    JPS Conference Proceedings (Internet)　8　021002\_1-021002\_5　2015/09

    DOI： 10.7566/JPSCP.8.021002 　

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    The famed yet elusive H-dibaryon, an exotic quark state ($uuddss$), was predicted several decades ago and also supported by recent Lattice QCD calculations. The E42 experiment has been approved at J-PARC to search for the H-dibaryon with high statistics. A large acceptance hyperon spectrometer with a time projection chamber (TPC) will be used for searching the H-dibaryon from $(K^-, K^+)$ reaction off nuclei via its possible following decays such as $\lambda\lambda$. The E42 experiment has high sensitivity both above and below $\lambda\lambda$ threshold and will be the definitive experiment on the existence of the H-dibaryon, once and for all. Recent progress and achievements of the E42 collaboration will be presented, which include simulations on estimation of TPC performance in the electric field and the magnetic field, testing and optimization of a prototype TPC, and preparation of various detectors.

  76. 27aSF-2 Study of the K^<bar>-nucleus interaction by using the C(K^-,p) reaction

    Ichikawa Y., Ekawa H., Kato S., Kanatsuki S., Gogami T., Takahashi T., Takahashi H., Nagae T., Hirose E., Moritsu M.

    Meeting Abstracts of the Physical Society of Japan　70　301-301　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_301 　

    ISSN： 2189-079X

  77. 25aSH-10 Construction status of a new spectrometer "S-2S'' for high-resolution spectroscopy of hypernuclei with S=-2 at J-PARC

    Kanatsuki S., Ichikawa Y., Ekawa H., Kato S., Gogami T., Takahashi T., Takahashi H., Nagae T., Hirose E., Moritsu M.

    Meeting Abstracts of the Physical Society of Japan　70　232-232　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_232 　

    ISSN： 2189-079X

  78. 25aSH-11 Construction status of a new spectrometer "S-2S'' for high-resolution spectroscopy of hypernuclei with S=-2 at J-PARC

    Kanatsuki S., Ichikawa Y., Ekawa H., Gogami T., Nagae T.

    Meeting Abstracts of the Physical Society of Japan　70　233-233　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_233 　

    ISSN： 2189-079X

  79. Observation of the "K-pp"-like structure in the d(π+, K+) reaction at 1.69 GeV/ c Peer-reviewed

    Ichikawa, Y., Nagae, T., Fujioka, H., Bhang, H., Bufalino, S., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Hasegawa, S., Hayakawa, S., Honda, R., Hosomi, K., Imai, K., Ishimoto, S., Joo, C., Kanatsuki, S., Kiuchi, R., Koike, T., Kumawat, H., Matsumoto, Y., Miwa, K., Moritsu, M., Naruki, M., Niiyama, M., Nozawa, Y., Ota, R., Sakaguchi, A., Sako, H., Samoilov, V., Sato, S., Shirotori, K., Sugimura, H., Suzuki, S., Takahashi, T., Takahashi, T.N., Tamura, H., Tanaka, T., Tanida, K., Tokiyasu, A.O., Tsamalaidze, Z., Roy, B., Ukai, M., Yamamoto, T.O., Yang, S.

    Progress of Theoretical and Experimental Physics　2015　(2)　021D01\_1-021D01\_8　2015

    DOI： 10.1093/ptep/ptv002 　

  80. Development of a silicon micro-strip detector for tracking high intensity secondary beams Peer-reviewed

    R. Kiuchi, H. Asano, S. Hasegawa, R. Honda, Y. Ichikawa, K. Imai, C. W. Joo, K. Nakazawa, H. Sako, S. Sato, K. Shirotori, H. Sugimura, K. Tanida, T. Watabe

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　763　399-403　2014/11

    DOI： 10.1016/j.nima.2014.06.060 　

    ISSN： 0168-9002

    eISSN： 1872-9576

  81. Development of a prototype GEM TPC with a gating grid for an H-dibaryon search experiment at J-PARC Peer-reviewed

    H. Sako, H. Sugimura, J. K. Ahn, Y. Han, S. Hasegawa, S. H. Hwang, Y. Ichikawa, K. Imai, R. Kiuchi, K. Ozawa, S. Sato, K. Shirotori

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　763　65-81　2014/11

    DOI： 10.1016/j.nima.2014.06.007 　

    ISSN： 0168-9002

    eISSN： 1872-9576

  82. Inclusive spectrum of the d(pi(+), K+) reaction at 1.69 GeV/c Peer-reviewed

    Yudai Ichikawa, Tomofumi Nagae, Hyoungchan Bhang, Stefania Bufalino, Hiroyuki Ekawa, Petr Evtoukhovitch, Alessandro Feliciello, Hiroyuki Fujioka, Shoichi Hasegawa, Shuhei Hayakawa, Ryotaro Honda, Kenji Hosomi, Ken'ichi Imai, Shigeru Ishimoto, Changwoo Joo, Shunsuke Kanatsuki, Ryuta Kiuchi, Takeshi Koike, Harphool Kumawat, Yuki Matsumoto, Koji Miwa, Manabu Moritsu, Megumi Naruki, Masayuki Niiyama, Yuki Nozawa, Ryosuke Ota, Atsushi Sakaguchi, Hiroyuki Sako, Valentin Samoilov, Susumu Sato, Kotaro Shirotori, Hitoshi Sugimura, Shoji Suzuki, Toshiyuki Takahashi, Tomonori N. Takahashi, Hirokazu Tamura, Toshiyuki Tanaka, Kiyoshi Tanida, Atsushi O. Tokiyasu, Zviadi Tsamalaidze, Bidyut Roy, Mifuyu Ukai, Takeshi O. Yamamoto, Seongbae Yang

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS　2014　(10)　101D03\_1-101D03\_8　2014/10

    DOI： 10.1093/ptep/ptu128 　

    ISSN： 2050-3911

  83. High-resolution search for the Θ+ pentaquark via a pion-induced reaction at J-PARC Peer-reviewed

    Moritsu M, Adachi S, Agnello M, Ajimura S, Aoki K, Bhang H.C, Bassalleck B, Botta E, Bufalino S, Chiga N, Ekawa H, Evtoukhovitch P, Feliciello A, Fujioka H, Hayakawa S, Hiruma F, Honda R, Hosomi K, Ichikawa Y, Ieiri M, Igarashi Y, Imai K, Ishibashi N, Ishimoto S, Itahashi K, Iwasaki R, Joo C.W, Kanatsuki S, Kim M.J, Kim S.J, Kiuchi R, Koike T, Komatsu Y, Kulikov V.V, Marcello S, Masumoto S, Matsumoto Y, Matsuoka K, Miwa K, Nagae T, Naruki M, Niiyama M, Noumi H, Nozawa Y, Ota R, Ozawa K, Saito N, Sakaguchi A, Sako H, Samoilov V, Sato M, Sato S, Sato Y, Sawada S, Sekimoto M, Shirotori K, Sugimura H, Suzuki S, Takahashi H, Takahashi T, Takahashi T.N, Tamura H, Tanaka T, Tanida K, Tokiyasu A.O, Tomida N, Tsamalaidze Z, Ukai M, Yagi K, Yamamoto T.O, Yang S.B, Yonemoto Y, Yoon C.J, Yoshida K

    Physical Review C - Nuclear Physics　90　(3)　035205　2014/09

    DOI： 10.1103/PhysRevC.90.035205 　

    ISSN： 0556-2813

    eISSN： 1089-490X

  84. Development of a GEM-TPC for H-dibaryon search experiment at J-PARC Peer-reviewed

    H. Sako, J. K. Ahn, K. H. Baek, B. Bassalleck, H. Fujioka, L. Guo, S. Hasegawa, K. Hicks, R. Honda, S. H. Hwang, Y. Ichikawa, M. Ieiri, K. Imai, S. H. Kim, R. Kiuchi, H. S. Lee, K. Nakazawa, M. Naruki, A. Ni, M. Niiyama, K. Ozawa, J. Y. Park, S. Y. Ryu, S. Sato, K. Shirotori, H. Sugimura, M. Sumihara, K. Tanida, H. Takahashi, T. Takahashi

    JOURNAL OF INSTRUMENTATION　9　(4)　C04009\_1-C04009\_10　2014/04

    DOI： 10.1088/1748-0221/9/04/C04009 　

    ISSN： 1748-0221

  85. Development of a GEM-TPC for H-dibaryon search experiment at J-PARC

    H. Sako, J. K. Ahn, K. H. Baek, B. Bassalleck, H. Fujioka, L. Guo, S. Hasegawa, K. Hicks, R. Honda, S. H. Hwang, Y. Ichikawa, M. Ieiri, K. Imai, S. H. Kim, R. Kiuchi, H. S. Lee, K. Nakazawa, M. Naruki, A. Ni, M. Niiyama, K. Ozawa, J. Y. Park, S. Y. Ryu, S. Sato, K. Shirotori, H. Sugimura, M. Sumihara, K. Tanida, H. Takahashi, T. Takahashi

    JOURNAL OF INSTRUMENTATION　9　4　2014/04

    DOI： 10.1088/1748-0221/9/04/C04009 　

    ISSN： 1748-0221

  86. High Precision γ-ray Spectroscopy of \(_{\Lambda }^{4}\text{He}\) and \(_{\Lambda }^{19}\text{F}\) at J-PARC

    S. B. Yang, M. Agnello, Y. Akazawa, N. Amano, K. Aoki, E. Botta, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, T. Haruyama, S. Hasegawa, S. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, Y. Ichikawa, Y. Igarashi, K. Imai, S. Ishimoto, R. Iwasaki, S. Kanatsuki, K. Kasami, T. Koike, J. K. Lee, J. Y. Lee, S. Marcello, K. Miwa, S. Nagao, M. Nakagawa, M. Naruki, H. Sako, V. Samoilov, Y. Sasaki, S. Sato, T. Shiozaki, K. Shirotori, H. Sugimura, S. Suzuki, H. Takahashi, T. Takahashi, H. Tamura, K. Tanabe, K. Tanida, Z. Tsamalaidze, M. Ukai, T. F. Wang, T. O. Yamamoto, Y. Yamamoto

    Proceedings of the 12th Asia Pacific Physics Conference (APPC12)　2014/03/19

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.1.013076 　

  87. High Precision γ-ray Spectroscopy of 4ΛHe and 19ΛF at J-PARC Peer-reviewed

    S.B. Yang, M. Agnello, Y. Akazawa, N. Amano, K. Aoki, E. Botta, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, T. Haruyama, S. Hasegawa, S. Hayakawa, R. Honda, K. Hosomi, S.H. Hwang, Y. Ichikawa, Y. Igarashi, K. Imai, S. Ishimoto, R. Iwasaki, S. Kanatsuki, K. Kasami, T. Koike, J.K. Lee, J.Y. Lee, S. Marcello, K. Miwa, S. Nagao, M. Nakagawa, M. Naruki, H. Sako, V. Samoilov, Y. Sasaki, S. Sato, T. Shiozaki, K. Shirotori, H. Sugimura, S. Suzuki, H. Takahashi, T. Takahashi, H. Tamura, K. Tanabe, K. Tanida, Z. Tsamalaidze, M. Ukai, T.F. Wang, T. O. Yamamoto, Y. Yamamoto

    JPS Conf.Proc.　1　013076　2014/03

  88. Study on 6ΛH hypernucleus by the (π-, K+) reaction at J-PARC Peer-reviewed

    Sugimura H, Agnello M, Ahn J.K, Ajimura S, Akazawa Y, Amano N, Aoki K, Bhang H.C, Endo M, Evtoukhovitch P, Feliciello A, Fujioka H, Fukuda T, Hasegawa S, Hayakawa S, Honda R, Hosomi K, Hwang S.H, Ichikawa Y, Igarashi Y, Imai K, Ishibashi N, Iwasaki R, Joo C.W, Kiuchi R, Lee J.K, Lee J.Y, Matsuda K, Matsumoto Y, Matsuoka K, Miwa K, Mizoi Y, Moritsu M, Nagae T, Nagamiya S, Nakagawa M, Naruki M, Noumi H, Ota R, Roy B.J, Saha P.K, Sakaguchi A, Sako H, Samanta C, Samoilov V, Sasaki Y, Sato S, Sekimoto M, Shimizu Y, Shiozaki T, Shirotori K, Soyama T, Takahashi T, Takahashi T.N, Tamura H, Tanabe K, Tanaka T, Tanida K, Tokiyasu A.O, Tsamalaidze Z, Ukai M, Yamamoto T.O, Yamamoto Y, Yang S.B, Yoshida K

    EPJ Web of Conferences　66　09017　2014/03

    DOI： 10.1051/epjconf/20146609017 　

    ISSN： 2101-6275

    eISSN： 2100-014X

  89. Search for H-dibaryon at J-PARC with a Large Acceptance TPC Peer-reviewed

    Sako H, Ahn J.K, Baek K.Y, Bassalleck B, Fujioka H, Guo L, Hasegawa S, Hicks K, Honda R, Hwang S.H, Ichikawa Y, Ieiri M, Imai K, Kim S.H, Kiuchi R, Lee H.S, Nakazawa K, Naruki M, Ni A, Niiyama M, Ozawa K, Park J.Y, Park S.H, Ryu S.Y, Sato S, Shirotori K, Sugimura H, Sumihara M, Tanida K, Takahashi H, Takahashi T

    EPJ Web of Conferences　66　09015　2014/03

    DOI： 10.1051/epjconf/20146609015 　

    ISSN： 2101-6275

    eISSN： 2100-014X

  90. Search for 6(Lambda)H hypernucleus by the 6Li(pi(-), K+) reaction at p pi=1.2 GeV/c Peer-reviewed

    H. Sugimura, M. Agnello, J. K. Ahn, S. Ajimura, Y. Akazawa, N. Amano, K. Aoki, H. C. Bhang, N. Chiga, M. Endo, P. Evtoukhovitch, A. Feliciello, H. Fujioka, T. Fukuda, S. Hasegawa, S. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, Y. Ichikawa, Y. Igarashi, K. Imai, N. Ishibashi, R. Iwasaki, C. W. Joo, R. Kiuchi, J. K. Lee, J. Y. Lee, K. Matsuda, Y. Matsumoto, K. Matsuoka, K. Miwa, Y. Mizoi, M. Moritsu, T. Nagae, S. Nagamiya, M. Nakagawa, M. Naruki, H. Noumi, R. Ota, B. J. Roy, P. K. Saha, A. Sakaguchi, H. Sako, C. Samanta, V. Samoilov, Y. Sasaki, S. Sato, M. Sekimoto, Y. Shimizu, T. Shiozaki, K. Shirotori, T. Soyama, T. Takahashi, T. N. Takahashi, H. Tamura, K. Tanabe, T. Tanaka, K. Tanida, A. O. Tokiyasu, Z. Tsamalaidze, M. Ukai, T. O. Yamamoto, Y. Yamamoto, S. B. Yang, K. Yoshida

    PHYSICS LETTERS B　729　39-44　2014/02

    DOI： 10.1016/j.physletb.2013.12.062 　

    ISSN： 0370-2693

    eISSN： 1873-2445

  91. Study on H-6(Lambda) hypernucleus by the (pi(-), K+) reaction at J-PARC Peer-reviewed

    H. Sugimura, M. Agnello, J. K. Ahn, S. Ajimura, Y. Akazawa, N. Amano, K. Aoki, H. C. Bhang, M. Endo, P. Evtoukhovitch, A. Feliciello, H. Fujioka, T. Fukuda, S. Hasegawa, S. Hayakawa, R. Honda, K. Hosomi, S. H. Hwang, Y. Ichikawa, Y. Igarashi, K. Imai, N. Ishibashi, R. Iwasaki, C. W. Joo, R. Kiuchi, J. K. Lee, J. Y. Lee, K. Matsuda, Y. Matsumoto, K. Matsuoka, K. Miwa, Y. Mizoi, M. Moritsu, T. Nagae, S. Nagamiya, M. Nakagawa, M. Naruki, H. Noumi, R. Ota, B. J. Roy, P. K. Saha, A. Sakaguchi, H. Sako, C. Samanta, V. Samoilov, Y. Sasaki, S. Sato, M. Sekimoto, Y. Shimizu, T. Shiozaki, K. Shirotori, T. Soyama, T. Takahashi, T. N. Takahashi, H. Tamura, K. Tanabe, T. Tanaka, K. Tanida, A. O. Tokiyasu, Z. Tsamalaidze, M. Ukai, T. O. Yamamoto, Y. Yamamoto, S. B. Yang, K. Yoshida

    INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 2　66　2014

    DOI： 10.1051/epjconf/20146609017 　

    ISSN： 2100-014X

  92. Search for the Eta(+) pentaquark at J-PARC Peer-reviewed

    M. Moritsu, S. Adachi, M. Agnello, S. Ajimura, K. Aoki, H. C. Bhang, B. Bassalleck, E. Botta, S. Bufalino, N. Chiga, H. Ekawa, P. Evtoukhovitch, A. Feliciello, H. Fujioka, S. Hayakawa, F. Hiruma, R. Honda, K. Hosomi, Y. Ichikawa, M. Ieiri, Y. Igarashi, K. Imai, N. Ishibashi, S. Ishimoto, K. Itahashi, R. Iwasaki, C. W. Joo, S. Kanatsuki, M. J. Kim, S. J. Kim, R. Kiuchi, T. Koike, Y. Komatsu, V. V. Kulikov, S. Marcello, S. Masumoto, Y. Matsumoto, K. Matsuoka, K. Miwa, T. Nagae, M. Naruki, M. Niiyama, H. Noumi, Y. Nozawa, R. Ota, K. Ozawa, N. Saito, A. Sakaguchi, H. Sako, V. Samoilov, M. Sato, S. Sato, Y. Sato, S. Sawada, M. Sekimoto, K. Shirotori, H. Sugimura, S. Suzuki, H. Takahashi, T. Takahashi, T. N. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A. O. Tokiyasu, N. Tomida, Z. Tsamalaidze, M. Ukai, K. Yagi, T. O. Yamamoto, S. B. Yang, Y. Yonemoto, C. J. Yoon, K. Yoshida

    NUCLEAR PHYSICS A　914　91-96　2013/09

    DOI： 10.1016/j.nuclphysa.2013.01.010 　

    ISSN： 0375-9474

    eISSN： 1873-1554

  93. Study of Neutron-Rich Hypernuclei by the (pi (-), K (+)) Reaction at J-PARC Peer-reviewed

    Sugimura H, Ajimura S, Bhang H. C, Busso L, Endo M, Faso D, Fukuda T, Hasegawa S, Hayakawa S, Honda R, Ichikawa Y, Imai K, Ishibashi N, Kishimoto T, Kiuchi R, Matsuda K, Matsuoka K, Miwa K, Mizoi Y, Morra O, Nagamiya S, Nakagawa M, Noumi H, Ota R, Saha P. K, Sako H, Samanta C, Sato S, Shimizu Y, Shirotori K, Soyama T, Sakaguchi A, Takahashi T, Takahashi T. N, Tanaka T, Yoshida K

    FEW-BODY SYSTEMS　54　(7-10)　1235-1238　2013/08

    DOI： 10.1007/s00601-013-0655-8 　

    ISSN： 0177-7963

  94. J-PARC E27 Experiment to Search for a Nuclear Kaon Bound State K (-) pp Peer-reviewed

    Y. Ichikawa, H. C. Bhang, S. Bufalino, H. Ekawa, P. Evtoukhovitch, A. Feliciello, H. Fujioka, S. Hasegawa, S. Hayakawa, R. Honda, K. Hosomi, K. Imai, S. Ishimoto, C. W. Joo, S. Kanatsuki, R. Kiuchi, T. Koike, H. Kumawat, Y. Matsumoto, K. Miwa, M. Moritsu, T. Nagae, M. Naruki, M. Niiyama, Y. Nozawa, R. Ota, A. Sakaguchi, H. Sako, V. Samoilov, S. Sato, K. Shirotori, H. Sugimura, S. Suzuki, T. Takahashi, T. N. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A. O. Tokiyasu, Z. Tsamalaidze, B. J. Roy, M. Ukai, T. O. Yamamoto, S. B. Yang

    FEW-BODY SYSTEMS　54　(7-10)　1191-1194　2013/08

    DOI： 10.1007/s00601-013-0668-3 　

    ISSN： 0177-7963

    eISSN： 1432-5411

  95. Search for Pentaquark I similar to (+) in Hadronic Reaction at J-PARC Peer-reviewed

    M. Naruki, S. Adachi, M. Agnello, S. Ajimura, K. Aoki, H. Bang, B. Bassalleck, E. Botta, S. Bufalino, H. Ekawa, P. Evtoukhovitch, A. Feliciello, H. Fujioka, S. Hayakawa, F. Hiruma, R. Honda, K. Hosomi, Y. Ichikawa, M. Ieiri, Y. Igarashi, K. Imai, N. Ishibashi, S. Ishimoto, K. Itahashi, R. Iwasaki, G. G. Joo, S. Kanatsuki, M. J. Kim, S. J. Kim, R. Kiuchi, T. Koike, Y. Komatsu, V. V. Kulikov, S. Marcello, S. Masumoto, Y. Matsumoto, K. Matsuoka, K. Miwa, M. Moritsu, T. Nagae, M. Niiyama, H. Noumi, Y. Nozawa, R. Ota, K. Ozawa, N. Saito, A. Sakaguchi, H. Sako, V. Samoilov, M. Sato, S. Sato, Y. Sato, S. Sawada, M. Sekimoto, K. Shirotori, H. Sugimura, S. Suzuki, T. N. Takahashi, H. Takahashi, T. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A. O. Tokiyasu, N. Tomida, Z. Tsamalaidze, M. Ukai, K. Yagi, T. O. Yamamoto, S. B. Yang, Y. Yonemoto, C. J. Yoon, K. Yoshida

    FEW-BODY SYSTEMS　54　(7-10)　955-960　2013/08

    DOI： 10.1007/s00601-013-0685-2 　

    ISSN： 0177-7963

    eISSN： 1432-5411

  96. Search for Θ+ via the pion induced reaction at J-PARC: J-PARC E19 Peer-reviewed

    K. Shirotori, T.N. Takahashi, S. Adachi, M. Agnello, S. Ajimura, K. Aoki, H.C. Bhang, B. Bassalleck, E. Botta, S. Bufalino, N. Chiga, P. Evtoukhovitch, A. Feliciello, H. Fujioka, F. Hiruma, R. Honda, K. Hosomi, Y. Ichikawa, M. Ieiri, Y. Igarashi, K. Imai, N. Ishibashi, S. Ishimoto, K. Itahashi, R. Iwasaki, C.W. Joo, M.J. Kim, S.J. Kim, R. Kiuchi, T. Koike, Y. Komatsu, V.V. Kulikov, S. Marcello, S. Masumoto, K. Matsuoka, K. Miwa, M. Moritsu, T. Nagae, M. Naruki, M. Niiyama, H. Noumi, K. Ozawa, N. Saito, A. Sakaguchi, H. Sako, V. Samoilov, M. Sato, S. Sato, Y. Sato, S. Sawada, M. Sekimoto, H. Sugimura, S. Suzuki, H. Takahashi, T. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A.O. Tokiyasu, N. Tomida, Z. Tsamalaidze, M. Ukai, K. Yagi, T.O. Yamamoto, S.B. Yang, Y. Yonemoto, C.J. Yoon, K. Yoshida

    Few Body Syst.　54　(1)　145-150　2013/03

    DOI： 10.1007/s00601-012-0367-5 　

  97. Trigger electronics upgrade of PHENIX muon tracker Peer-reviewed

    S. Adachi, T. Akiyama, K. Aoki, H. Asano, S. Ebesu, Y. Fukao, Y. Haki, M. Hata, Y. Ichikawa, H. Iinuma, Y. Ikeda, M. Ikeno, K. Imai, Y. Imazu, K. Karatsu, M. Kasai, H. Kawamura, E. Kim, K. Kurita, T. Mibe, T. Murakami, J. Murata, I. Nakagawa, K. R. Nakamura, R. Nakanishi, K. Ninomiya, M. Nitta, N. Ogawa, J. Onishi, S. Park, Y. Sada, N. Saito, R. Sameshima, O. Sasaki, A. Sato, E. Seitaibashi, K. Senzaka, K. Shoji, A. Taketani, K. Tanida, T. Toyoda, K. Watanabe

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　703　114-132　2013

    DOI： 10.1016/j.nima.2012.11.088 　

    ISSN： 0168-9002

  98. Study of kaonic nuclei by the d(φ+;K+) reaction at J-PARC Peer-reviewed

    Ichikawa Y, Bhang H.C, Bufalino S, Ekawa H, Evtoukhovitch P, Feliciello A, Fujioka H, Hasegawa S, Hayakawa S, Honda R, Hosomi K, Imai K, Ishimoto S, Joo W.C, Kanatsuki S, Kiuchi R, Koike T, Kumawat H, Matsumoto Y, Miwa K, Nagae T, Naruki M, Niiyama M, Nozawa Y, Ota R, Sakaguchi A, Sako H, Samoilov V, Sato S, Shirotori K, Sugimura H, Suzuki S, Takahashi T, Takahashi T.N, Tamura H, Tanaka T, Tanida K, Tokiyasu A.O, Tsamalaidze Z, Roy B.J, Ukai M, Yamamoto T.O, Yang S

    Proceedings of Science　2013

    eISSN： 1824-8039

  99. Search for the Theta(+) Pentaquark via the pi(-) p -&gt; K- X Reaction at 1.92 GeV/c Peer-reviewed

    K. Shirotori, T. N. Takahashi, S. Adachi, M. Agnello, S. Ajimura, K. Aoki, H. C. Bhang, B. Bassalleck, E. Botta, S. Bufalino, N. Chiga, P. Evtoukhovitch, A. Feliciello, H. Fujioka, F. Hiruma, R. Honda, K. Hosomi, Y. Ichikawa, M. Ieiri, Y. Igarashi, K. Imai, N. Ishibashi, S. Ishimoto, K. Itahashi, R. Iwasaki, C. W. Joo, M. J. Kim, S. J. Kim, R. Kiuchi, T. Koike, Y. Komatsu, V. V. Kulikov, S. Marcello, S. Masumoto, K. Matsuoka, K. Miwa, M. Moritsu, T. Nagae, M. Naruki, M. Niiyama, H. Noumi, K. Ozawa, N. Saito, A. Sakaguchi, H. Sako, V. Samoilov, M. Sato, S. Sato, Y. Sato, S. Sawada, M. Sekimoto, H. Sugimura, S. Suzuki, H. Takahashi, T. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A. O. Tokiyasu, N. Tomida, Z. Tsamalaidze, M. Ukai, K. Yagi, T. O. Yamamoto, S. B. Yang, Y. Yonemoto, C. J. Yoon, K. Yoshida

    PHYSICAL REVIEW LETTERS　109　(13)　132002\_1-132002\_5　2012/09

    DOI： 10.1103/PhysRevLett.109.132002 　

    ISSN： 0031-9007

  100. J‐PARC大強度ビーム向けゲート機能付きGEM‐TPCの開発と性能評価(3)

    杉村仁志, 今井憲一, 佐藤進, 佐甲博之, 市川裕大, 小沢恭一郎

    日本物理学会講演概要集　67　(1)　74-74　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  101. Beam and SKS spectrometers at the K1.8 beam line Toshiyuki Takahashi1 Peer-reviewed

    Adachi S, Agnello M, Aoki K, Araoka O, Bassalleck B, Botta E, Bufalino S, Chiga N, Evtoukhovitch P, Feliciello A, Franz J, Fujioka H, Hayakawa S, Hirose E, Honda R, Hosomi K, Ichikawa Y, Igarashi Y, Iida M, Ikeno M, Itahashi K, Ishibashi N, Ishimoto S, Iwasaki R, Kakiguchi Y, Kasami K, Kim S, Kiuchi R, Koike T, Komatsu Y, Kustov A, Mjavia D, Makida Y, Marcello S, Maruta T, Masumoto S, Matsuoka K, Miwa K, Moiseenko A, Moritsu M, Nagae T, Naruki M, Noumi H, Ohhata H, Okamura T, Ota R, Saito M, Sakaguchi A, Samoilov V, Sato M, Sato Y, Sekimoto M, Shirakabe Y, Shirotori K, Sugimura H, Suzuki S, Suzuki Y, Takahashi H, Takahashi T.N, Tamura H, Tanaka M, Tauchi K, Tanaka T, Tanida K, Tokiyasu A.O, Yoshida K, Toyoda A, Tsamalaidze Z, Uchida T, Ukai M, Watanabe H, Yamamoto T.O, Yonemoto Y, Yoon C.-J

    Progress of Theoretical and Experimental Physics　2012　(1)　2012

    DOI： 10.1093/ptep/pts023 　

    ISSN： 2050-3911

  102. The first experiment at the J-PARC K1.8 beam line using the SKS spectrometer Peer-reviewed

    K. Shirotori, T.N. Takahashi, S. Adachi, M. Agnello, S. Ajimura, K. Aoki, H.C. Bhang, B. Bassalleck, E. Botta, S. Bufalino, N. Chiga, P. Evtoukhovitch, A. Feliciello, H. Fujioka, F. Hiruma, R. Honda, K. Hosomi, Y. Ichikawa, M. Ieiri, Y. Igarashi, K. Imai, N. Ishibashi, S. Ishimoto, K. Itahashi, R. Iwasaki, C.W. Joo, M.J. Kim, S.J. Kim, R. Kiuchi, T. Koike, Y. Komatsu, V.V. Kulikov, S. Marcello, S. Masumoto, K. Matsuoka, K. Miwa, M. Moritsu, T. Nagae, M. Naruki, M. Niiyama, H. Noumi, K. Ozawa, N. Saito, A. Sakaguchi, H. Sako, V. Samoilov, M. Sato, S. Sato, Y. Sato, S. Sawada, M. Sekimoto, H. Sugimura, S. Suzuki, H. Takahashi, T. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A.O. Tokiyasu, N. Tomida, Z. Tsamalaidze, M. Ukai, K. Yagi, T.O. Yamamoto, S.B. Yang, Y. Yonemoto, C.J. Yoon, K. Yoshida

    J.Phys.Conf.Ser.　312　052023　2011/09

    DOI： 10.1088/1742-6596/312/5/052023 　

Show all ︎Show first 5

Misc. 33

  1. Development of Active Fiber Target (AFT) for high precision spectroscopy of Xi hypernucleus

    原田健志, 江端健悟, 後神利志, 早川修平, 市川裕大, 三輪浩司, 永江知文, 七村拓野, 高橋俊行, 鵜養美冬, 山本剛史

    日本物理学会講演概要集(CD-ROM)　77　(1)　2022

    ISSN： 2189-079X

  2. Preparation status of missing mass spectroscopy experiment of Ξ hypernuclei with S-2S magnetic spectrometer

    江端健悟, 藤岡宏之, 後神利志, 原田健志, 早川修平, 市川裕大, 鎌田健人, 三輪浩司, 永江知文, 七村拓野, 根岸亮輔, 大浦文也, 坂尾珠和, 高橋俊行, 高橋仁, 田村裕和, 鵜養美冬, 山本剛史

    日本物理学会講演概要集(CD-ROM)　77　(1)　2022

    ISSN： 2189-079X

  3. Measurement of X rays from Fe-Ξ- atom J-PARC E03 (2)

    石川勇二, 叶内萌香, 田村裕和, 三輪浩司, 鎌田健人, 谷田聖, 山本剛史, 藤田真奈美, 市川裕大, 早川修平, 鵜養美冬, 本多良太郎

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  4. Measurement of X rays from Fe-Ξ- atom J-PARC E03 (1)

    叶内萌香, 石川勇二, 田村裕和, 三輪浩司, 鎌田健人, 谷田聖, 山本剛史, 藤田真奈美, 市川裕大, 早川修平, 鵜養美冬, 本多良太郎

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  5. J-PARC E42/45実験の為のMPPCを用いた高時間分解能ホドスコープの開発(2)

    市川裕大, 佐甲博之, 長谷川勝一, 谷田聖, 佐藤進, AHN Jung Keun, KIM Shinhyung, JUNG Wooseung, HICKS Kenneth, HWANG Sanghoon

    日本物理学会講演概要集(CD-ROM)　74　(1)　2019

    ISSN： 2189-079X

  6. 三次元飛跡検出器HypTPCの高ビームレート試験

    市川裕大, 佐甲博之, 長谷川勝一, 谷田聖, 佐藤進, 吉田純也, 江川弘之, 江川弘之, 足利沙希子, 足利沙希子, 七村拓野, 七村拓野, 鈴木一輝, 鈴木一輝, 早川修平, 早川修平, 赤石貴也, 白鳥昂太郎, AHN Jung Keun, YANG Seongbae, KIM Shinhyung, JUNG Wooseung, CHOI Sungwook, KANG Byungmin, LEE Jaeyong

    量子科学技術研究開発機構研究報告書(Web)　(13)　2019

  7. 三次元飛跡検出器HypTPCの高ビームレート試験

    市川裕大, 佐甲博之, 長谷川勝一

    量子科学技術研究開発機構研究報告書(Web)　(8)　246 (WEB ONLY)　2018/09

  8. J-PARC E42/45実験の為のMPPCを用いた高時間分解能ホドスコープの開発

    市川裕大, 佐甲博之, 長谷川勝一, 谷田聖, 佐藤進, AHN Jung Keun, KIM Shinhyung, JUNG Wooseung, HICKS Kenneth, HWANG Sanghoon

    日本物理学会講演概要集(CD-ROM)　73　(1)　2018

    ISSN： 2189-079X

  9. J-PARC-HI Collaboration

    J. K. Ahn, Y. Akamatsu, M. Asakawa, O. Busch, M. Chiu, T. Chujo, P. Cirkovic, T. Csörgő, G. David, D. Devetak, M. Dordevic, S. Esumi, H. Fujii, K. Fukushima, P. Garg, T. Gunji, T. Hachiya, H. Hamagaki, H. Hamagaki, H. Harada, M. Harada, S. Hasegawa, S. Hasegawa, T. Hatsuda, T. Hirano, B. Hong, H. Hotchi, S. H. Hwang, Y. Ichikawa, T. Ichisawa, K. Imai, K. Imai, M. Inaba, K. Itakura, K. Itakura, J. Kamiya, M. Kaneta, H. Kato, S. Kato, B. C. Kim, E. J. Kim, M. Kinsho, M. Kitazawa, M. Kitazawa, A. Kovalenko, Y. Liu, X. Luo, T. Maruyama, Y. Miake, J. Milosevic, D. Mishra, K. Morita, K. Morita, K. Murase, L. Nadjdjerdj, S. Nagamiya, S. Nagamiya, S. Nagamiya, S. Nagamiya, J. Nakamura, T. Nakamura, Y. Nara, M. Naruki, K. Nishio, C. Nonaka, T. Nonaka, M. Ogino, A. Ohnishi, M. Oka, M. Oka, A. Okabe, M. Okamura, K. Oyama, K. Ozawa, K. Ozawa, K. Ozawa, P. K. Saha, T. Saito, T. Saito, A. Sakaguchi, T. Sakaguchi, S. Sakai, H. Sako, H. Sako, H. Sako, K. Sato, S. Sato, S. Sato, S. Sawada, S. Sawada, K. Shigaki, S. Shimansky, M. Shimomura, Y. Shobuda, M. Stojanovic, H. Sugimura, Y. Takeuchi, F. Tamura, H. Tamura, J. Tamura

    Nuclear Physics A　967　985-986　2017/11/01

    DOI： 10.1016/S0375-9474(17)30379-2 　

    ISSN： 0375-9474

  10. K中間子原子核探索の為の次世代型三次元飛跡検出器の開発

    市川裕大, 杉村仁志, 佐甲博之, 長谷川勝一, 谷田聖, 佐藤進, 細見健二, 今井憲一, AHN Jung Keun, KIM Shinhyung, HWANG Sanghoon

    日本物理学会講演概要集(CD-ROM)　72　(1)　2017

    ISSN： 2189-079X

  11. J-PARCにおけるHダイバリオン探索のための崩壊粒子飛跡検出器HypTPCの開発

    杉村仁志, 佐甲博之, 長谷川勝一, 谷田聖, 市川裕大, 佐藤進, 細見健二, 今井憲一, AHN JungKeun, KIM Shinhyung, HWANG Sanghoon

    日本物理学会講演概要集(CD-ROM)　71　(2)　2016

    ISSN： 2189-079X

  12. Development of a GEM-based TPC for H-dibaryon search at J-PARC

    Sako Hiroyuki, Hwang S., Ichikawa Yudai, Imai Kenichi, Sato Susumu, Sugimura Hitoshi

    Proceedings of Science (Internet)　213　300\_1-300\_4　2015/07

    DOI： 10.22323/1.213.0300 　

    ISSN： 1824-8039

    More details Close

    We develop a TPC (Time Projection Chamber) using GEM (Gas Electron Multiplier) to search for H-dibaryon at J-PARC E42 experiment. We evaluated performance of a small prototype TPC. We performed a long term operation test for one month which is similar term as E42. We suppressed hit position distortion with $\pm$0.2 mm due to ion backflow.

  13. 28pTF-2 Development of a water Cherenkov counter for the E05 experiment at J-PARC

    Amano N., Ichikawa Y., Ekawa H., Kato S., Kanatsuki S., Sugimura H., Takahashi T., Takahashi H., Nagae T., Fujioka H., Moritsu M.

    Meeting abstracts of the Physical Society of Japan　69　(1)　94-94　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  14. Search for K^-pp bound state via the d(π^+,K^+)reation (3)

    Ichikawa Y., the J-PARC E27 Collaboration

    Meeting abstracts of the Physical Society of Japan　68　(2)　85-85　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  15. Development of a water Cherenkov counter for the E05 experiment at J-PARC

    Amano N., Ichikawa Y., Ekawa H., Kato S., Kanatsuki S., Sugimura H., Takahashi T., Takahashi H., Nagae T., Fujioka H., Moritsu M.

    Meeting abstracts of the Physical Society of Japan　68　(2)　19-19　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  16. Preparation status of a new spectrometer "S-2S" for high-resolution spectroscopy of hypernuclei with S=-2 at J-PARC

    Kanatsuki S., Amano N., Ichikawa Y., Ekawa H., Kato S., Takahashi T., Takahashi H., Nagae T., Hirose E., Fujioka H., Moritsu M.

    Meeting abstracts of the Physical Society of Japan　68　(2)　68-68　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  17. Design of a new spectrometer "S-2S" for high-resolution spectroscopy of many-body systems with multi-strangeness

    Kanatsuki S., Ichikawa Y., Ekawa H., Kato S., Takahashi T., Takahashi H., Nagae T., Fujioka H., Moritsu M.

    Meeting abstracts of the Physical Society of Japan　68　(1)　79-79　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  18. 27pHC-2 Production Experiment of neutron-rich hypernuclei ^6_ΛH at J-PARC

    Sugimura Hitoshi, Honda Ryotaro, Sakaguchi Atsushi, Ota Ryosuke, Hayakawa Shuhei, Nakagawa Manami, Soyama Toshiya, Ichikawa Yudai, Imai Ken'ichi, Nagamiya Shoji, Sako Hiroyuki, Sato Susumu, Hasegawa Shoichi, J-PARC E10 Collaboration

    Meeting abstracts of the Physical Society of Japan　68　(1)　94-94　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  19. 27pHC-6 Search for K^-pp bound state via the d(π^+,K^+)reation (2)

    Ichikawa Y.

    Meeting abstracts of the Physical Society of Japan　68　(1)　95-95　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  20. 27pHC-14 Development of hypTPC for H-dibaryon search experiment at J-PARC

    Hwang S. H., Ahn J. K., Hasegawa S., Ichikawa Y., Imai K., Kim S. H., Lee H. S., Ni A., Park J. Y., Sako H., Sugimura H.

    Meeting abstracts of the Physical Society of Japan　68　(1)　96-96　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  21. GEM基板を用いたゲート機能の開発

    佐藤進, 佐甲博之, 長谷川勝一, 杉村仁志, 杉村仁志, 市川裕大, 市川裕大, 小沢恭一郎, 小沢恭一郎, 木内隆太, 木内隆太, SANGHOON Hwang, SANGHOON Hwang, 今井憲一

    日本物理学会講演概要集　68　(1)　2013

    ISSN： 1342-8349

  22. 11pSC-11 Development of a 2nd level trigger to select Kaon by using TDC information

    Miwa Koji, Honda Ryotaro, Sugimura Hitoshi, Ichikawa Yudai

    Meeting abstracts of the Physical Society of Japan　67　(2)　64-64　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  23. 11pSC-12 Design of a new spectrometer "S-2S" for high-resolution spectroscopy of many-body systems with multi-strangeness

    Kanatsuki Shunsuke, Ichikawa Yudai, Ekawa Hiroyuki, Kato Seigo, Takahashi Toshiyuki, Takahashi Hitoshi, Fujioka Hiroyuki, Nagae Tomofumi, Moritsu Manabu

    Meeting abstracts of the Physical Society of Japan　67　(2)　64-64　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  24. J-PARC大強度ビーム向けゲート機能付きGEM-TPCの開発と性能評価(2)

    市川裕大, 市川裕大, 今井憲一, 佐藤進, 佐甲博之, 杉村仁志, 小沢恭一郎

    日本物理学会講演概要集　67　(1)　2012

    ISSN： 1342-8349

  25. d(π+,K+)反応を用いたK-pp束縛状態の探索

    市川裕大, 市川裕大, 足立智, 浅野秀光, 石元茂, 今井憲一, 江川弘行, 金築俊輔, 小池武志, 佐田優太, 白鳥昂太郎, 杉村仁志, 杉村仁志, 高橋俊行, 田村裕和, 時安敦史, 豊田晃弘, 永江知文, 成木恵, 藤岡宏之, 細見健二, 三輪浩司, 森津学

    日本物理学会講演概要集　67　(2)　2012

    ISSN： 1342-8349

  26. J-PARCにおけるK中間子原子核探索実験に用いる飛程検出器の性能評価

    江川弘行, 永江知文, 足立智, 浅野秀光, 石元茂, 市川裕大, 市川裕大, 今井憲一, 金築俊輔, 小池武志, 佐田優太, 白鳥昂太郎, 杉村仁志, 杉村仁志, 高橋俊行, 田村裕和, 時安敦史, 豊田晃弘, 成木恵, 藤岡宏之, 細見健二, 三輪浩司, 森津学

    日本物理学会講演概要集　67　(2)　2012

    ISSN： 1342-8349

  27. 24aGC-7 Design of Spectrometer for H-dibaryon Search at J-PARC

    Sako Hiroyuki, Ahn Jung Keun, Hwang San Hoon, Imai Ken'ichi, Sato Susumu, Hasegawa Shoichi, Shirotori Kotaro, Sugimura Hitoshi, Ichikawa Yudai, Honda Ryotaro, Kiuchi Ryuta

    Meeting Abstracts of the Physical Society of Japan　67　(0)　73-73　2012

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.67.1.1.0_73_3 　

    ISSN： 1342-8349

  28. 14aSC-5 Search for K^-_<pp> bound state via the d(π^+,K^+) reation

    Ichikawa Y., Shirotori K., Sugimura H., Takahashi T., Tamura H., Tokiyasu A. O., Toyoda A., Nagae T., Naruki M., Fujioka H., Hosomi K., Adachi S., Miwa K., Moritsu M., Asano H., Ishimoto S., Imai K., Ekawa H., Kanatsuki S., Koike T., Sada Y.

    Meeting Abstracts of the Physical Society of Japan　67　(0)　91-91　2012

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.67.2.1.0_91_3 　

  29. 24aGC-12 Performance evaluation of fiber position detector for high intensity beam tracking

    Matsumoto Y., Ekawa H., Kanatsuki S., Sugimura H., Ozawa K., Kiuchi R., Joo Changwoo, Yang Seongbae, Kanno K., Nakai W., Miwa K., Honda R., Hasegawa S., Imai K., Shirotori K., Sako H., Sato S., Ichikawa Y.

    Meeting Abstracts of the Physical Society of Japan　67　(0)　74-74　2012

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.67.1.1.0_74_4 　

    ISSN： 1342-8349

  30. J-PARC大強度ビーム向けゲート機能付きGEM-TPCの開発と性能評価

    杉村仁志, 今井憲一, 佐藤進, 佐甲博之, 市川裕大, 小沢恭一郎

    日本物理学会講演概要集　66　(2)　2011

    ISSN： 1342-8349

  31. 26pGH-4 J-PARCにおけるK^-pp束縛状態探索実験(E27実験)に用いるレンジカウンターの開発(2)(26pGH 理論核物理領域,実験核物理領域合同 ハイパー核・ストレンジネスII(合同),理論核物理領域)

    市川 裕大, 高橋 俊行, 田村 裕和, 豊田 晃久, 時安 敦史, 永江 知史, 成木 恵, 藤岡 宏之, 細見 健二, 三輪 浩司, 森津 学, 足立 智, 浅野 光秀, 石元 茂, 今井 憲一, 小池 武志, 佐田 優太, 白鳥 昂太郎, 杉村 仁志

    日本物理学会講演概要集　66　(0)　51-51　2011

    Publisher: 一般社団法人 日本物理学会

    DOI： 10.11316/jpsgaiyo.66.1.1.0_51_3 　

  32. 20pBD-2 J-PARC,K1.8ビームラインにおけるd(π^+,K^+)反応を用いたK^-pp束縛状態生成実験の概要及びシミュレーション(20pBD 理論核物理領域,実験核物理領域合同 ハイパー核・ストレンジネスII(合同),理論核物理領域)

    岡村 敦史, 杉村 仁志, 高橋 俊行, 田村 裕和, 豊田 晃久, 永江 知文, 成木 恵, 藤岡 宏之, 細見 健二, 三輸 浩司, 森津 学, 足立 智, 浅野 秀光, 石元 茂, 市川 裕大, 今井 憲一, 小池 武志, 佐田 優太, 白鳥 昂太郎

    日本物理学会講演概要集　65　(0)　36-36　2010

    Publisher: 一般社団法人 日本物理学会

    DOI： 10.11316/jpsgaiyo.65.1.1.0_36_4 　

    ISSN： 1342-8349

  33. 12aSK-9 J-PARCにおけるK^-pp束縛状態探索実験(E27実験)に用いるレンジカウンターの開発(12aSK 検出器II,実験核物理領域)

    市川 裕大, 高橋 俊行, 田村 裕和, 豊田 晃久, 時安 敦史, 永江 知文, 成木 恵, 藤岡 宏之, 細見 健二, 三輪 浩司, 森津 学, 足立 智, 浅野 秀光, 石元 茂, 今井 憲一, 小池 武志, 佐田 優太, 白鳥 昂太郎, 杉村 仁志

    日本物理学会講演概要集　65　(0)　66-66　2010

    Publisher: 一般社団法人 日本物理学会

    DOI： 10.11316/jpsgaiyo.65.2.1.0_66_2 　

Show all ︎Show first 5

Presentations 61

  1. Cusp spectroscopy for Extracting the Scattering Length and its Relation to Femtoscopy Invited

    Yudai Ichikawa

    Femtum 2025, Sofia, Bulgaria　2025/04/16

  2. Femtoscopy including an α measurement and the decomposition for spin-dependent processes and Cusp spectroscopy in pp/pA/AA collision Invited

    Yudai Ichikawa

    The 2nd Workshop on Highly Baryonic Matter at RHIC-BES and Future Facilities --- beyond the Critical Point towards Neutron Stars --- (WHBM2025), Tsukuba, Japan　2025/03/08

  3. ΣN cusp spectroscopy using d(K-, pi-) reaction at J-PARC (J-PARC E90) and future prospects

    Yudai Ichikawa

    REIMEI Workshop on phi meson, exotic hadrons, and related topics, Busan, Korea　2025/02/28

  4. Femtoscopic study and related hadron physics in the J-PARC-HI project Invited

    Yudai Ichikawa

    The 1st international workshop on physics at High Baryon Density, Wuhan, China　2024/11/02

  5. A GEM based TPC “HypTPC” and its upgrade with thin Glass GEM for the hadron experiment at J-PARC Invited

    Yudai Ichikawa

    The 4th J-PARC Symposium 2024, Mito, Japan　2024/10/17

  6. Study of Xi-hypernucleus using 12C(K-, K+) reaction

    Yudai Ichikawa

  7. FEMTOSCOPIC STUDY IN THE J-PARC-HI PROJECT Invited

    Yudai Ichikawa

    Hadron interactions with strangeness and charm (Reimei 2024), Jeju, Korea　2024/06/27

  8. Study of Ξ and Kaonic nuclear bound state using 12C(K-, K+) and 12C(K-, p) reaction at J-PARC Invited

    Yudai Ichikawa

    SPICE: Strangeness hadron as a Precison tool for strongly InterCting systEms, Trento, Italy　2024/05/13

  9. J-PARC-HI project Invited

    Yudai Ichikawa

    Fourth International Workshop on the Extenstion Project for the J-PARC Hadron Experimental Facility (HEF-ex 2024), Ibaraki, Japan　2024/02/21

  10. $K^{bar}$ and nucleus system studied by $^{12}$C($K^-$, $p$) reaction International-presentation

    Ichikawa, Yudai, Sako, Hiroyuki, Sato, Susumu, Tanida, Kiyoshi, Hasegawa, Shoichi, Tamura, Hirokazu

    13th International Conference on Hypernuclear and Strange Particle Physics (HYP 2018)　2018/06

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    We have measured an inclusive missing-mass spectrum of the $^{12}$C$(K^-, p)$ reaction over wide energy region at the kaon incident momentum of 1.8 GeV/$c$ at J-PARC K1.8 beam line. We have compared the observed missing-mass spectrum with a DWIA calculation to study the $\bar{K}$-nucleus interaction. In this comparison, we have changed the depth of both real and imaginary part of the optical potential between $\bar{K}$ and nucleus. It is found that the observed spectrum is well reproduced by the calculation of the potential depth of $V_0 \sim -100$ MeV (real part) and $W_0 \sim -40$ MeV (imaginary part). On the other hand, we have observed the definitive excess in the deeply bound region $B_{K} > 100$ MeV, which cannot be explained by the any optical potential. This excess can be interpreted as a deeply bound $\Lambda(1405)$ nucleus.

  11. High-resolution spectroscopic study of the $\Xi$-hypernuclei with S-2S spectrometer International-presentation

    Nanamura, Takuya, Ichikawa, Yudai, Nagae, Tomofumi, Ekawa, Hiroyuki, Tanida, Kiyoshi

    13th International Conference on Hypernuclear and Strange Particle Physics (HYP 2018)　2018/06

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    Spectroscopic study of $\Xi$-hypernuclei provides insights into the $\Xi$-$N$ interaction and the $\Xi N \to \Lambda \Lambda$ coupling strength. A missing mass spectroscopy of the $\Xi$-hypernuclei was performed via the $^{12}$C$(K^-,K^+)$ reaction at J-PARC K1.8 beam line in 2015. In this measurement, we have achieved the missing mass resolution 5.4 MeV (FWHM). It is important to achieve a better missing mass resolution. As the next step, we are constructing a new spectrometer S-2S (Strangeness -2 Spectrometer) for the $K^+$. In this condition, the total missing-mass resolution would be affected mainly due to the target energy loss straggling. To reduce energy loss straggling in the target, we are developing an active target composed of scintillating fibers. Construction of the magnets and most parts of detectors for S-2S has been completed. It will soon be ready for installation in J-PARC K1.8.

  12. Development of the high time resolution Hodoscope with MPPC for the J-PARC E42 and E45

    Sako, Hiroyuki, Hasegawa, Shoichi, Sato, Susumu, Tanida, Kiyoshi, Ichikawa, Yudai

    日本物理学会第73回年次大会　2018/03

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    J-PARC E42(Hダイバリオン探索実験)/E45(($\pi$, 2$\pi$)反応を利用したハドロン分光実験)実験用に新しいスペクトロメータHyperon Spectrometerを開発している。このHyperon Spectrometerは、超電導電磁石Hyperon Magnet, 三次元飛跡検出器HypTPC, 時間検出器TPC Hodoscopeで構成される。ここで、TPC Hodoscopeは高磁場中に設置するため、磁場中でも動作可能なMPPCを用いて、100ps程度の高時間分解能の性能を目指している。我々は150$\times$70$\times$10(T)mm$^{3}$の小型のシンチレータ(実機は長さ800mmを想定している)を製作し、MPPCを両端に接続し、実験室で宇宙線を用いてテストを行った。高時間分解能を得るため、MPPCを1, 2, 4個と複数設置し、測定を行った。また、接続方法として、直列接続, NIM Mixer, Individual(接続なしでoff-line解析で平均化)を使用したデータを取得した。

  13. Development of the time projection chamber to search for the kaonic nuclei

    Ichikawa, Yudai

    日本物理学会第72回年次大会　2017/03

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    近年、反K中間子と原子核の束縛状態であるK中間子原子核の研究が活発に進められている。J-PARC E27実験の結果からは、最も単純なK中間子原子核"K-pp"と考えられる信号が検出された。しかし、E27実験では崩壊粒子用の検出器として、プラスチックシンチレータを並べた飛程検出器を使用したため、位置分解能・統計・立体角が乏しく、スピン・パリティの議論を行うことができずに、信号の起源を特定できなかった。そこで、我々はHダイバリオン探索(K中間子ビームを使用)のために現在開発を進めている三次元飛跡検出器Time Projection Chamberを飛程検出器の代りに使用する。高精度・高統計のデータを取得し、部分波解析を行う。この実験では期待されるビーム強度が106Hz程度であるK中間子ではなく、$\pi$中間子をビームとして使用するため、TPCが現在達成している$10^{6}$Hzのビーム強度耐性をさらに向上させなくてはならない。ここで、Hyp-TPCは電子増幅部にGas Electron Multiplier (GEM)を使用している。そこで、我々はビーム通過部のみ電子増幅をしない程度に印可電圧を下げることでGEMをマスクする手法(Mask-GEM)を用いて、$10^{7}$Hz以上のビーム強度耐性を得る。我々はMask-GEMを製作し、Hyp-TPCに組み込み、実験室での性能評価及び、ELPHで電子ビームを用いたテストを行った。

  14. K$^{\rm bar}$-nucleus interaction studied by $^{12}$C($K^{-}, p$) spectrum International-presentation

    Ichikawa, Yudai

    2016 JAEA/ASRC Reimei Workshop; New exotic hadron matter at J-PARC　2016/10

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    An interaction between K$^{\rm bar}$ and nucleus is studied by using the X-ray from the kaonic atoms for a long time. However, it is difficult to determine the K$^{bar}$-nucleus interaction by using only kaonic-atoms data because the value of shift and width of the X-ray depend not only the potential depth but also the type of theoretical model. Thus, we study the K$^{\rm bar}$-nucleus interaction by comparing an observed missing-mass spectrum of the $^{12}$C($K^{-}, p$) reaction with the DWIA calculation. Such a study has already reported from KEK-E548 experiment. However, their experiment is not enough to determine these interaction because they were pointed out about the experimental condition. Thus, we performed the further experiment to take the real spectrum of $^{12}$C($K^{-}, p$) reaction at J-PARC.

  15. Development of HypTPC for searching H-dibaryon

    Sugimura, Hitoshi, Sako, Hiroyuki, Ichikawa, Yudai, Sato, Susumu, Tanida, Kiyoshi, Hasegawa, Shoichi

    日本物理学会2016年秋季大会(素粒子,核物理,宇宙線・宇宙物理)　2016/09

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    We developed HypTPC for H-dibaryon search experiment at J-PARC. HypTPC can measure high-intensity Kaon beam and decay of $\Lambda$ hyperon. We have done high voltage test and confirmed it works well.

  16. Study of the strange dibaryon system by using pion beam

    Ichikawa, Yudai

    日本物理学会2016年秋季大会(素粒子,核物理,宇宙線・宇宙物理)　2016/09

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    ストレンジネスダイバリオンの系は近年熱心に研究がなされているものの、未だ明らかになっていない部分が多い。本研究ではJ-PARCにおいてd$(\pi^{+}, K^{+})$反応を用い、質量欠損法により生成粒子の質量スペクトルを求めた。$\Lambda$, $\Sigma$の生成領域については、得られた質量スペクトルは素過程の断面積を用いたモンテカルロシミュレーションと概ね一致していることを確認した。一方、$\Lambda$(1405), $\Sigma$(1385)の領域ではデータがシミュレーションに対して約30MeVシフトしていることを検出した。このシフトはY*N間の相互作用に起因しているかもしれない。また、前方散乱のスペクトルからは2.13GeV/c2付近に$\Sigma$N-$\Lambda$N転換反応の閾値におけるカスプ構造を検出した。また、陽子対を飛程検出器で同時検出し、終状態が$\Sigma^{0}$pであることを要求した質量スペクトルから、K-ppとも解釈可能な幅の広い構造を検出した。得られた質量と崩壊幅はそれぞれ2275 +17-18 (stat.) +21-30 (syst.) MeV/c2、162 +87-45 (stat.) +66-78 (syst.) MeVである。これは、K-ppに対する束縛エネルギー95 +18-17 (stat.) +30-21 (syst.) MeVに相当する。

  17. Observation of $\Xi$ bound states in the $^{12}$C$(K^-,K^+)X$ reaction at 1.8 GeV/$c$ in J-PARC International-presentation

    Nagae, Tomofumi, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, Hayakawa, Shuhei, Nakada, Yoshiyuki, of others

    26th International Nuclear Physics Conference (INPC 2016)　2016/09

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    We have carried out a pilot data taking of the J-PARC E05 experiment to search for the bound state peaks of $^{12}_{\Xi}$Be in the $^{12}$C$(K^-,K^+)X$ reaction at 1.8 GeV/$c$. The measurement was performed at the K1.8 beam line of the J-PARC hadron experimental hall with a typical $K^-$ beam intensity of $6 \times 10^5$ every six seconds. So far the best energy resolution of about 6 MeV FWHM was achieved with the existing SKS spectrometer. With a reasonable statistics, we have succeeded to observe peak structures in the bound region, which seems to suggest that the potential depth of $\Xi$ would be deeper than 14 MeV estimated in the previous measurements.

  18. Baryon spectroscopy in $(\pi,2\pi)$ reactions with 10$^{6}$Hz pion beams at J-PARC International-presentation

    Sako, Hiroyuki, Hasegawa, Shoichi, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Hicks, K, Ahn, J. K, Kim, S. H, Lee, J. W, Hwang, S. H

    26th International Nuclear Physics Conference (INPC 2016)　2016/09

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    Although baryon resonances have been studied for a long time, our knowledge on their properties are still limited. Recently a Dynamical-Couple Channel (DCC) model shows there are significant contributions of $(\pi,2\pi)$ reactions to these baryon resonances. However, there are only 240 thousand events of $(\pi, 2\pi)$ reaction data measured in 1970's. Thus, we proposed an experiment E45 to study baryon resonances in $(\pi,2\pi)$ reaction utilizing $10^6$ Hz $\pi$ beams at J-PARC. We aim at clarifying most of baryon mass levels. We measure these reactions in a large acceptance Time Projection Chamber inside a Helmholtz dipole magnet. We will measure these reactions in small momentum steps over a large beam momentum range and perform partial wave analysis to extract properties of each resonance. In this presentation, we will show the experimental design, expected results in simulations, and the status of the detectors.

  19. Study of the $\overline{K}$-nucleus interaction by using the $^{12}$C(K$^{-}$, p) reaction at J-PARC International-presentation

    Ichikawa, Yudai, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Imai, Kenichi, Kimbara, Shinji, Nakada, Yoshiyuki, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, of others

    14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2016)　2016/07

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    An interaction between K$^{bar}$ and nucleus is studied by using the X-ray from the kaonic atoms for a long time. However, it is difficult to determine the K$^{bar}$-nucleus interaction by using only kaonic-atoms data because the value of shift and width of the X-ray depend not only the potential depth but also the type of theoretical model. Thus, we study the $\overline{K}$-nucleus interaction by comparing an observed missing-mass spectrum of the $^{12}$C(K$^{-}$, p) reaction with the DWIA calculation. Such a study has already reported from KEK-E548 experiment. However, their experiment is not enough to determine these interaction because they were pointed out about the experimental condition. Thus, we performed the further experiment to take the real spectrum of $^{12}$C(K$^{-}$, p) reaction at J-PARC.

  20. Study of K$^{bar}$-Nucleus interaction by using C(K$^{-}$, p) reaction, 2

    Ichikawa, Yudai

    日本物理学会第71回年次大会　2016/03

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    K$^{bar}$-原子核間の相互作用は主にK中間子原子のX線のデータを用いて長年研究がなされているが、得られる結果が理論モデルの導入手法に強く依存してしまうため、K中間子原子のX線のデータのみからK$^{bar}$-原子核間の相互作用を導出することは困難である。そこで、我々はJ-PARCにおいてC(K$^{-}$, p)反応における質量欠損スペクトルを測定し、理論計算と比較することでK$^{bar}$-原子核間の相互作用の実験的研究を行う。本実験は2015年10-11月にデータ取得を行った。本手法を用いた解析は高エネルギー加速器研究機構(KEK)の陽子シンクロトロンで行われた実験で既に行われているが、KEKでの実験で得られたスペクトルは崩壊粒子検出器で荷電粒子を検出することを要求した半包括的なスペクトルである。そのため、崩壊粒子検出器での検出条件によりスペクトルが歪められている可能性が議論されている。そこで、本実験では(K$^{-}$, p)だけを測定する包括的な測定を行うことで、KEKでの実験で問題となった部分を解消する。

  21. Study of the K$^{bar}$-nucleus interaction by using the C(K$^{-}$, p) reaction

    Ichikawa, Yudai

    日本物理学会2015年秋季大会(素粒子,核物理,宇宙線・宇宙物理)　2015/09

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    An interaction between K$^{bar}$ and nucleus is studied by using the X-ray from the kaonic atoms for a long time. However, it is difficult to determine the K$^{bar}$-nucleus interaction by using only X-ray because the value of shift and width of X-ray is not only the potential depth but also the type of theoretical model. Thus, we plan to study it from the other way. In this study, we measure the missing-mass spectrum of the C(K$^{-}$, p) reaction at J-PARC and compare it with the DWIA calculation. Such kind of study have already reported from an experiment at Proton Synchrotron (E548). However, their spectrum is not inclusive one but semi-inclusive one, which is required at least one charged particle hit by their decay counter. Therefore, it is point out that this requirement can distort the inclusive spectrum. In our experiment, we will carry out the inclusive missing-mass spectroscopy by measuring only the K$^{-}$ and proton's momenta. Furthermore, we plan to install the decay counter to check whether at least one charged particle hit distort it or not.

  22. Studies of high density baryon matter with high intensity heavy-ion beams at J-PARC International-presentation

    Sako, Hiroyuki, Harada, Hiroyuki, Sakaguchi, Takao, Chujo, Tatsuya, Esumi, Shinichi, Gunji, Taku, Hasegawa, Shoichi, Hwang, S, Ichikawa, Yudai, Imai, Kenichi, Itakura, Kazunori, Kaneta, Masashi, Kim, B. C, Kinsho, Michikazu, Kitazawa, Masakiyo, Liu, Y, Masui, Hiroshi, Nagamiya, Shoji, Nishio, Katsuhisa, Okamura, Masahiro, Oyama, Ken, Ozawa, Kyoichiro, Saha, P. K, Sakaguchi, Atsushi, Sato, Susumu, Shigaki, Kenta, Sugimura, Hitoshi, Tanida, Kiyoshi, Tamura, Jun, Tamura, Hirokazu, Nara, Yasushi, Saito, Takehiko

    25th International Conference on Ultrarelativistic Heavy-Ion Collisions (Quark Matter 2015)　2015/09

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    We are designing a large acceptance heavy-ion spectrometer at J-PARC based on a Toroidal magnet to measure hadrons, lepton pairs, and event-by-event fluctuations. We are also designing a closed geometry spectrometer to measure hypernuclei to study weak decays and magnetic moments. In this presentation, the preliminary version of the designed acceleration scheme, as well as the spectrometers and their expected performance and physics results are presented.

  23. $\gamma$-ray spectroscopy of hypernuclei; Recent results and prospect at J-PARC International-presentation

    Tamura, Hirokazu, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Hwang, S, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, J-PARC E, Collaboration, of others

    12th International Conference on Hypernuclear and Strange Particle Physics (HYP 2015)　2015/09

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    The present status and future prospects of precision $\gamma$-ray spectroscopy of $\Lambda$ hypernuclei are described. A new experiment (J-PARC E13) has been performed at the J-PARC K1.8 line employing a newly-developed germanium (Ge) detector array, Hyperball-J, via the $(K^-,\pi^-)$ reaction on $^4$He and $^{19}$F targets. This is the first study of $s$-shell and $sd$-shell $\Lambda$ hypernuclei with Ge detectors. The $^4$He target spectrum exhibited a $\gamma$-ray peak of $^4_{\Lambda}{\rm He}(1^+\to 0^+)$ at $1.406 \pm 0.002 \pm 0.002$ MeV. Compared with the energy ($1.09 \pm 0.02$ MeV) of the corresponding transition for the mirror hypernucleus, $^4_{\Lambda}{\rm H}(1^+\to 0^+)$, the present result clearly indicates a large charge symmetry breaking (CSB) effect. This decisive data for CSB allows a stringent test of baryon-baryon interaction models. As for the $^{19}$F target run, a preliminary spectrum shows several $\gamma$-ray peaks assigned to $^{19}_{\Lambda}{\rm F}$ transitions. Future plans of $\gamma$-ray spectroscopy are also discussed.

  24. Results of the J-PARC E27 experiment International-presentation

    Ichikawa, Yudai, Imai, Kenichi

    4th Joint Meeting of the Nuclear Physics Divisions of the American Physical Society and The Physical Society of Japan (Hawaii 2014)　2014/10

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    While the existence of kaonic nuclei has been intensively studied both theoretically and experimentally, there is no conclusive result establishing its existence.Here, we have searched for the $K^-pp$, a bound state of a $K^-$ with two protons, in the $d(\pi^+, K^+)$ reaction at 1.69 GeV/$c$ at J-PARC K1.8 beam line with a missing-mass resolutionof 2.7 MeV/$c^2$(FWHM). In this reaction, the $K^-pp$ is assumed to be produced as $\Lambda(1405)$ as a doorwaysuch as $\pi^+n \to K^+\Lambda^*$, $\Lambda^*p \to K^-pp$.Since the sticking probability of the $\Lambda^*$ on proton would not be so large, coincidence of high-momentum ($>$ 250 MeV/$c$) proton(s) in large emission angles ($39^\circ<\theta_{lab.}<122^\circ$) was requested to enhance the signal-to-background ratio. We have obtained an inclusive $(\pi^+, K^+)$ spectrum in a wide missing-mass range from $\Lambda$, $\Sigma$ to $\Lambda(1405)$/$\Sigma(1385)$, for the first time. A proton coincidence spectrum shows a large proton-emission probability at around 2.27 GeV/$c^2$ as a broad bump. It might be attributed to the $K^-pp$ production. A study of decay branch suggests non-mesonic decays of $\Lambda N$and $\Sigma N$ are dominant rather than mesonic decays.

  25. Searching for the H-Dibaryon in J-PARC with a large acceptance hyperon spectrometer International-presentation

    Han, Y, Hasegawa, Shoichi, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, J-PARC E, Collaboration, of others

    2nd International Symposium on Science at J-PARC (J-PARC 2014)　2014/07

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    The famed yet elusive H-dibaryon, an exotic quark state ($uuddss$), was predicted several decades ago and also supported by recent Lattice QCD calculations. The E42 experiment has been approved at J-PARC to search for the H-dibaryon with high statistics. A large acceptance hyperon spectrometer with a time projection chamber (TPC) will be used for searching the H-dibaryon from $(K^-, K^+)$ reaction off nuclei via its possible following decays such as $\lambda\lambda$. The E42 experiment has high sensitivity both above and below $\lambda\lambda$ threshold and will be the definitive experiment on the existence of the H-dibaryon, once and for all. Recent progress and achievements of the E42 collaboration will be presented, which include simulations on estimation of TPC performance in the electric field and the magnetic field, testing and optimization of a prototype TPC, and preparation of various detectors.

  26. Measurement of the $\Lambda$ spin-flip $B(M1)$ value in hypernuclei International-presentation

    Sasaki, Yuki, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, of others

    2nd International Symposium on Science at J-PARC (J-PARC 2014)　2014/07

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    A hypernuclear $\gamma$-ray spectroscopy experiment (E13) will be performed using $K^-$ beam at the K1.8 beam line of the J-PARC Hadron Experimental Facility in 2015. In this experiment, we will determine the $B(M1)$ value of the $\Lambda$ spin-flip transition of the ground state doublet in $^{19}_{\Lambda}F$ to investigate the magnetic moment of a $\Lambda$ hyperon in nuclei. In order to check the performance of the whole spectrometer system of E13, a commissioning run was performed at the K1.8 beam line in 2013. We confirmed that the E13 setup is almost ready for the next beam time in 2015. In particular, new detectors for suppressing events from the two main $K^-$ decay modes in the on-line and off-line analyses are installed. As a result, the signal to noise ratio of $\gamma$ spectra is drastically improved, and the sensitivity to the $B(M1)$ measurement is expected to increase.

  27. Study of $\Lambda N$ interaction via the $\gamma$-ray spectroscopy of $^4_{\Lambda}$He and $^{19}_{\Lambda}$F (E13-1st) International-presentation

    Yamamoto, T. O, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, of others

    2nd International Symposium on Science at J-PARC (J-PARC 2014)　2014/07

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    A $\gamma$-ray spectroscopy experiment via the $(K^-, \pi^-)$ reaction (J-PARC E13-1st) will be performed at the J-PARC Hadron Experimental Facility using a newly developed Ge detector array, Hyperball-J. Spin-dependent $\Lambda N$ interactions will be studied through the precise measurement of the structure of hypernuclei, $^4_{\Lambda}$He and $^{19}_{\Lambda}$F. In May 2013, commissioning of whole detector system was carried out and calibration data were taken. In particular, production cross sections of $\Sigma^+$ and $^{12}_{\Lambda}$C via the $(K^-, \pi^-)$ reaction on the CH$_2$ target for $p_K = 1.5$ and 1.8 GeV/$c$ were obtained.

  28. J-PARC E19 experiment; Pentaquark $\Theta^+$ search in hadronic reaction at J-PARC International-presentation

    Takahashi, Tomonori, Ekawa, Hiroyuki, Hayakawa, Shuhei, Hosomi, Kenji, Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, J-PARC E, Collaboration, of others

    2nd International Symposium on Science at J-PARC (J-PARC 2014)　2014/07

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    A search for the $\Theta^+$ pentaquark in the $\pi^-p \to K^-X$ reaction was performed at the J-PARC Hadron Facility. Two data samples were collected in 2010 and 2012 at $\pi^-$ beam momenta of 1.92 and 2.0 GeV/$c$, respectively. No peak structure was observed in the missing mass spectra obtained from either data set. The upper limit for the production cross section averaged over the scattering-angle range of $2^{\circ}$ to $15^{\circ}$ in the laboratory frame was found to be 0.28 $\mu$b/sr. The decay width of the $\Theta^+$ can be directly connected to the production cross section through a theoretical calculation using an effective Lagrangian. The estimated upper limits of the width were 0.41 and 2.8 MeV for the spin-parities of $1/2^+$ and $1/2^-$, respectively.

  29. J-PARC E27 experiment to search for a $K^{-}pp$ bound state International-presentation

    Ichikawa, Yudai, Ekawa, Hiroyuki, Hasegawa, Shoichi, Hayakawa, Shuhei, Hosomi, Kenji, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi, Tanida, Kiyoshi, of others

    2nd International Symposium on Science at J-PARC (J-PARC 2014)　2014/07

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    We have carried out an experimental search for the simplest kaonic nucleus, $K^{-}pp$, by using the $d(\pi^{+},K^{+})$ reaction at $p$ = 1.69 GeV/$c$. The differential cross section of this reaction with covering a wide missing-mass range from the $\Lambda$ production threshold to the $\Lambda$(1405)/$\Sigma$(1385) region has been measured for the first time. The inclusive missing-mass shape of the $\Lambda$ and $\Sigma$ production region was understood with a simple quasi-free picture except for an enhancement at 2.13 GeV/$c^{2}$ due to a $\Sigma N$ cusp. An obtained peak attributed to $Y^{*}$ production was significantly shifted to the low mass side compared with the simulation by -24 MeV/$c^{2}$.

  30. Development of a GEM-based TPC for H-dibaryon search at J-PARC International-presentation

    Sako, Hiroyuki, Hwang, S, Ichikawa, Yudai, Imai, Kenichi, Sato, Susumu, Sugimura, Hitoshi

    International Conference on Technology and Instrumentation in Particle Physics 2014 (TIPP 2014)　2014/06

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    We develop a TPC (Time Projection Chamber) using GEM (Gas Electron Multiplier) to search for H-dibaryon at J-PARC E42 experiment. We evaluated performance of a small prototype TPC. We performed a long term operation test for one month which is similar term as E42. We suppressed hit position distortion with $\pm$0.2 mm due to ion backflow.

  31. An Experimental study on the $K^-pp$ bound state by using the $d(\pi^+, K^+)$ reaction

    Ichikawa, Yudai, Imai, Kenichi

    第11回ハドロン・スクエア　2014/03

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    K中間子原子核はK中間子と原子核の束縛状態であり、$K^-pp$束縛状態は最も単純なK中間子原子核の候補と考えられている。我々はJ-PARC K1.8 beam lineにおいて$d(\pi^+,K^+)X$反応を用いて$K^-pp$束縛状態を探索している。本実験は$d(\pi^+,K^+)X$のうち、$\pi$中間子ビームをビームラインスペクトロメータで、K中間子の運動量をSksスぺクトロメータで測定し、Xの質量を運動学の計算から求める。さらに、$K^-pp$束縛状態の崩壊から発生する陽子も飛程検出器(RCA)で測定し、$K^-pp$束縛状態に対するS/N(signal/noise)を向上させている。飛程検出器を使用しない包括的なスペクトルに対しては、$\Lambda$や$\Sigma$粒子の生成領域についてはシミュレーションと一致しているが、Y*の生成領域にシミュレーションに対して約30MeV程度のずれを検出した。飛程検出器を使用した排他的な測定では2.3GeV付近に有意な幅の広い構造が検出した。準自由過程のハイペロン生成におけるシミュレーションではこの構造は再現できないことから、この構造は$K^-pp$束縛状態のシグナルである可能性がある。

  32. Search for light kaonic nuclei $K^-pp$ via the d($\pi^{+}$, $K^{+}$) reaction at J-PARC International-presentation

    Imai, Kenichi, Ichikawa, Yudai

    International School for Strangeness Nuclear Physics (SNP school 2014)　2014/02

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    J-PARC K1.8beam lineにおいてd($\pi^{+}$, $K^{+}$)X反応を用いて$K^-pp$束縛状態を探索している。本実験はd($\pi^{+}$, $K^{+}$)Xのうち、$\pi^+$中間子の運動量をビームラインスペクトロメータで、$K^{+}$中間子の運動量をSksスペクトロメータで測定し、Xの質量を運動学の計算から求める。さらに、$K^-pp$束縛状態の崩壊から発生する陽子も飛程検出器(RCA)で測定し、$K^-pp$束縛状態に対するS/N(signal/noise)を向上させる。我々は、2012年に本実験の第一段階のデータとして物理データの取得を行い、d($\pi^{+}$, $K^{+}$)X反応における生成粒子Xの質量分布(ミッシングマススペクトル)を初めて観測した。飛程検出器を使用しない包括的なスペクトルに対しては$\Lambda$, $\Sigma$粒子の生成領域についてはシミュレーションと一致しているが、Y*の生成領域にシミュレーションに対して約30MeV程度のずれが検出した。飛程検出器を使用した排他的な測定では2.3GeV付近に有意な幅の広い構造が検出した。準自由過程のハイペロン生成におけるシミュレーションではこの構造は再現できないことから、この構造は$K^-pp$束縛状態のシグナルである可能性がある。

  33. Study of kaonic nuclei by the d($\pi$$^{+}$, K$^{+}$) reaction at J-PARC International-presentation

    Imai, Kenichi, Ichikawa, Yudai

    15th International Conference on Hadron Spectroscopy (Hadron 2013)　2013/11

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    Kaonic nuclei are the bound state of kaon and nucleus. A K-pp is expected to be the simplest kaonic nucleus. We search for a K-pp in the d($\pi$$^{+}$, K$^{+}$) reaction at 1.7 GeV/c at the J-PARC K1.8 beam line. However, the production cross section of a K-pp is estimated to be very small and there are many background processes from quasi-free hyperon production. A range counter array (RCA) was constructed to detect the two high-momentum ($>$ 250 MeV/c) proton from a decay of a K-pp bound state and in order to reduce these quasi-free background processes. We took the physics data in 2012 as the first phase, and we obtained d($\pi$$^{+}$, K$^{+}$)X missing mass spectrum for the first time. In this data, 3.3$\times$10$^{11}$ pions were incident on the liquid deuterium target. The global shape of missing mass is understandable. However, a significant ($\sim$ 40 MeV) shift in the Y$^{*}$ region compared with a simulation is observed and a cusp structure at the $\Sigma$ N threshold is clearly observed.

  34. Development of TPC for J-PARC-E42 experiment; Performance evaluation of a prototype TPC in the magnetic field and development of large area GEMs

    Sako, Hiroyuki, Imai, Kenichi, Sato, Susumu, Hasegawa, Shoichi, Hwang, S. H, Sugimura, Hitoshi, Ichikawa, Yudai, Tanida, Kiyoshi, Kiuchi, Ryuta

    日本物理学会2013年秋季大会(素粒子,核物理,宇宙線・宇宙物理)　2013/09

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    J-PARC E42 is an experiment to search for the H-dibaryon in ($K^{-}$,$K^{+}$) reactions. The experimental setup consists of a larget solid angle TPC, a Helmholtz dipole magnet, and a $K^{+}$ spectrometer (Kurama). We have performed an experiment of a prototype TPC injecting a UV laser under magnetic field with the FM magnet in the J-PARC hadron facility hall. We have been also developing the second TPC which has the real size the pad plane and GEMs. In this presentation, we report the results of the prototype TPC and the status for the second TPC.

  35. Search for K-pp bound state in the d($\pi$$^{+}$, K$^{+}$), 3

    Ichikawa, Yudai, Imai, Kenichi

    日本物理学会2013年秋季大会(素粒子,核物理,宇宙線・宇宙物理)　2013/09

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    J-PARC E27実験は重水素標的における($\pi$$^{+}$, K$^{+}$)反応を用いた、最も単純なK中間子原子核であるK-pp束縛状態の探索実験である。本実験では$\pi$$^{+}$中間子ビームの運動量をビームラインスペクトロメータで、散乱K$^{+}$の運動量を超伝導K中間子スペクトロメータ(SKS)で測定し、ミッシングマスを組むという手法を用いる。また、本反応では準自由過程のハイペロン生成のバックグランドが大きくK-pp束縛状態の生成断面積が小さいと考えられているため、6台の飛程検出器群を標的の周りに設置しK-pp束縛状態の崩壊から生じる高運動量($>$250MeV/c)陽子を同時測定することでバックグラウンドを抑制する。我々は2012年6月にJ-PARC K1.8 Beam lineにおいて、J-PARC E27実験のpilotデータの取得を行った。本測定では7.6日間物理データを取得し、計3.3$\times$10$^{11}$個の$\pi$$^{+}$中間子を標的に入射することで4.0$\times$10$^{5}$の($\pi$$^{+}$,K$^{+}$)eventを得ることができた。既にpreliminaryな解析結果について報告を行ったが、今回はinclusiveスペクトルにおける各準自由過程の成分のフィッティング結果等、このデータ取得で得られた結果の最新の解析状況について議論する。

  36. Search for Kaonic nuclei in the d($\pi$$^{+}$, K$^{+}$) reaction at J-PARC

    Imai, Kenichi, Ichikawa, Yudai

    RCNP研究会「核子・ハイペロン多体系におけるクラスター現象」　2013/07

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    2012年6月にJ-PARC K1.8 Beam lineにおいて、J-PARC E27実験のpilot実験のデータ取得を行った。J-PARC E27実験とは重水素標的における($\pi$$^{+}$, K$^{+}$)反応を用いた、最も単純なK中間子原子核であるK$^{-}$pp束縛状態の探索実験である。本実験ではパイ中間子ビームの運動量をビームラインスペクトロメータで、散乱K$^{+}$の運動量を超伝導K中間子スペクトロメータ(SKS)で測定し、ミッシングマスを組むという手法を用いた。6月に行ったpilot実験では7.6日間のphysics runを行った。このphysics runでは計3.3$\times$10$^{11}$個の$\pi$$^{+}$中間子を標的に入射し、4.0$\times$10$^{11}$の($\pi$$^{+}$, K$^{+}$)eventを取得した。また、calibration runである$\Sigma$生成の結果から、約2.4MeVの質量分解能が得られていることと微分断面積が過去の実験値とおおむね一致していることを確認した。また、包括的な解析で$\Lambda$, $\Sigma$生成の領域は過去の泡箱の実験値をもとに行ったモンテカルロシミュレーションでおおむね一致していることを確認したが、Y*領域については上記のシミュレーションに対して質量が低い側にシフトしていることを見いだした。

  37. Development of a GEM-TPC for H-dibaryon search experiment at J-PARC International-presentation

    Sako, Hiroyuki, Ahn, J. K, Baek, K. H, Bassalleck, B, Fujioka, H, Guo, L, Hasegawa, Shoichi, Hicks, K, Honda, R, Hwang, S. H, Ichikawa, Yudai, Ieiri, M, Imai, Kenichi, Kim, S. H, Kiuchi, Ryuta, Lee, H. S, Nakazawa, K, Naruki, M, Ni, A, Niiyama, Masayuki, Ozawa, K, Park, J. Y, Ryu, S. Y, Sato, Susumu, Shirotori, Kotaro, Sugimura, Hitoshi, Sumihara, M, Tanida, Kiyoshi, Takahashi, H, Takahashi, T

    3rd International Conference on Micro Pattern Gaseous Detectors (MPGD 2013)　2013/07

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    A TPC has been developed for J-PARC E42 experiment to search for H-dibaryon in ($K^-$, $K^+$) reaction. An event with 2 $\pi^-$ and 2 protons decaying from H-dibaryon is searched for inside the TPC. The TPC has octagonal prism shape drift volume with about 50 cm diameter with 55 cm drift length filled with Ar-CH$_{4}$ (90:10) gas. At the end of the drift volume, 3-layer GEMs are equipped. In order to analyze momenta of produced particles, the TPC is applied with 1 T dipole magnetic field parallel to the drift electric field with a superconducting Helmholz magnet. In order to maximize the acceptance of H-dibaryon events, a diamond target is installed inside the TPC drift volume, in a cylindrical hole opened from the top to the middle of the drift volume. Since extremely high-rate $K^-$ beam is directly injected into the TPC drift volume to the target, a gating grid and GEMs are adopted to suppress positive-ion feedback.

  38. Search for $K^-pp$ in the d($\pi^+, K^+$) reaction, 2

    Imai, Kenichi, Ichikawa, Yudai

    日本物理学会第68回年次大会　2013/03

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    2012年6月にJ-PARC K1.8 Beam lineにおいて、J-PARC E27実験のpilot実験のデータ取得を行った。J-PARC E27実験とは重水素標的における($\pi^+,K^+$)反応を用いた、最も単純なK中間子原子核である$K^-pp$束縛状態の探索実験である。本実験では$\pi^+$中間子ビームの運動量をビームラインスペクトロメータで、散乱$K^+$の運動量を超伝導K中間子スペクトロメータ(SKS)で測定し、ミッシングマスを組むという手法を用いる。また、本反応では準自由過程のハイペロン生成のバックグランドが大きく$K^-pp$束縛状態の生成断面積が小さいと考えられているため、6台の飛程検出器群を標的の周りに設置しK-pp束縛状態の崩壊から生じる高運動量($>$250MeV/c)陽子を同時測定することでバックグラウンドを抑制する。6月に行ったpilot実験では7.6日間のphysics runを行った。このphysics runでは計3.3$\times 10^{11}$個の$\pi$+中間子を標的に入射し、4.0$\times 10^5$の($\pi^+,K^+$)eventを取得した。また、calibration runである$\Sigma^+$測定の結果から、約2.4MeVの質量分解能が得られていることと微分断面積が過去の実験値とおおむね一致していることを確認した。

  39. Search for H-dibaryon in ($K^{-}$,$K^{+}$) reaction at J-PARC, 1

    Sako, Hiroyuki, Imai, Kenichi, Sato, Susumu, Hasegawa, Shoichi, Hwang, S. H, Sugimura, Hitoshi, Ichikawa, Yudai, Tanida, Kiyoshi, Kiuchi, Ryuta, Ahn, J. K, Ni, A

    日本物理学会第68回年次大会　2013/03

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    The H-dibaryon has been proposed as a stable 6-quark sate, and various experiments have been performed to search for it, but never been successful. KEK-PS E224 and E522 experiments observed peaks near the $\Lambda$ $\Lambda$ threshold in the invariant mass spectra although statistics is not enough. On the other hand, recent lattice QCD calculations predict the H is a shallow bound state or a resonance state. We proposed J-PARC E42 experiment to search for the H-dibaryon in ($K^{+}$,$K^{-}$) reaction with two-order higher statistics and higher mass resolutions.

  40. Developments of gate functioning used GEM

    Sato, Susumu, Sako, Hiroyuki, Hasegawa, Shoichi, Sugimura, Hitoshi, Ichikawa, Yudai, Ozawa, Kyoichiro, Kiuchi, Ryuta, Hwang, S. H, Imai, Kenichi

    日本物理学会第68回年次大会　2013/03

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    GEM基板を電子増幅部に用いたTPC飛跡検出器を開発しているが、GEM基板にゲート機能を合わせて持つような動作手法を開発している。今回は、エッチングを用いた穴形成をしたGEM基板の作成を試みた。既存のTPCの試作機(ワイヤーを用いたゲート機能を持っている)の形状に合わせるにより、試験が行いやすい形状にした。又、幾つかの穴形状が試験できるように、エッチングの方法を工夫した。透過度を向上するため、できるだけ薄い薄膜を用いて製作した。

  41. Search for nuclear Kaon bound state K-pp via the ($\pi$$^{+}$,K$^{+}$) reaction at the J-PARC International-presentation

    Imai, Kenichi, Ichikawa, Yudai

    2nd International School for Strangeness Nuclear Physics (SNP School 2013)　2013/02

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    2012年6月にJ-PARC K1.8 Beam lineにおいて、J-PARC E27実験のpilot実験のデータ取得を行った。J-PARC E27実験とは重水素標的における($\pi$$^{+}$,K$^{+}$)反応を用いた、最も単純なK中間子原子核であるK-pp束縛状態の探索実験である。本実験では$\pi$$^{+}$中間子ビームの運動量をビームラインスペクトロメータで、散乱K$^{+}$の運動量を超伝導K中間子スペクトロメータ(SKS)で測定し、ミッシングマスを組むという手法を用いる。また、本反応では準自由過程のハイペロン生成のバックグランドが大きくK-pp束縛状態の生成断面積が小さいと考えられているため、6台の飛程検出器群からなるRCAを標的の周りに設置しK-pp束縛状態の崩壊から生じる高運動量($>$250MeV/c)陽子を同時測定することでバックグラウンドを抑制する。6月に行ったpilot実験では7.6日間のphysics runを行った。このphysics runでは計3.3$\times$10$^{11}$個の$\pi$$^{+}$中間子を標的に入射し、4.0$\times$10$^{5}$の($\pi$$^{+}$,K$^{+}$)eventを取得した。

  42. Search for a nuclear kaon bound state K-pp at the J-PARC

    Imai, Kenichi, Ichikawa, Yudai

    Future Prospects of Hadron Physics at J-PARC and Large Scale Computational Physics in 2013　2013/02

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    2012年6月にJ-PARC K1.8Beam lineにおいて、d($\pi^+,K^+$)反応を用いたK-pp束縛状態の探索実験であるJ-PARC E27実験を行った。本実験では、$\pi$中間子とK中間子の運動量をそれぞれスペクトロメータで測定し、約2MeVの高質量分解能でK-pp束縛状態の質量を測定する。また、本反応では、quasi-free過程のハイペロン生成のバックグラウンドが大きいため、これらのバックグラウンドを抑制するために標的の周りに6台の飛程検出器を設置し、K-pp束縛状態の崩壊から生じる250MeV/c以上の陽子を同時測定する。今回行った実験では、約3M/spiiのビーム強度で7.6日間物理runのデータを取得し、約3.3$\times$$10^{11}$個の$\pi$中間子を標的に入射し、4.0$\times$$10^5$個の($\pi^+, K^+$)eventを測定した。

  43. Study on $K^-pp$ bound state via the $d(\pi^+,K^+)$ reaction

    Ichikawa, Yudai, Imai, Kenichi

    日本物理学会2012年秋季大会(素粒子,核物理,宇宙線・宇宙物理)　2012/09

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    2012年6月にJ-PARC K1.8 Beam lineにおいて、J-PARC E27実験のpilot実験のデータ取得を行った。J-PARC E27実験とは重水素標的における$(\pi^+,K^+)$反応を用いた、最も単純な$K$中間子原子核である$K^-pp$束縛状態の探索実験である。本実験では${\pi^+}$中間子ビームの運動量をビームラインスペクトロメータで、散乱$K$$^{+}$の運動量を超伝導$K$中間子スペクトロメータ(SKS)で測定し、ミッシングマスを組むという手法を用いる。また、本反応では準自由過程のハイペロン生成のバックグランドが大きく$K^-pp$束縛状態の生成断面積が小さいと考えられているため、6台の飛程検出器郡からなるRCAを標的の周りに設置し$K^-pp$束縛状態の崩壊から生じる高運動量($>$250MeV/c)陽子を同時測定することでバックグラウンドを抑制する。6月に行ったpilot実験では7.6日間のphysics runを行った。このphysics runでは計3.3$\times$10$^{11}$個の${\pi^+}$中間子を標的に入射し、4.0$\times$10$^{5}$の$(\pi^+,K^+)$eventを得ることができた。

  44. J-PARC E27 experiment to search for a nuclear Kaon bound state $K^-pp$ International-presentation

    Imai, Kenichi, Ichikawa, Yudai, Hasegawa, Shoichi, Sako, Hiroyuki, Sato, Susumu, Kiuchi, Ryuta, Hosomi, Kenji, Sugimura, Hitoshi, of others

    20th International IUPAP Conference on Few-Body Problems in Physics (FB-20)　2012/08

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    In the J-PARC E27 experiment, we search for a $K^-pp$ bound state via the $d(\pi^{+}, K^+)$ reaction at 1.7 GeV/c at the K1.8 beam line. The binding energy and decay width of the $K^-pp$ bound state can be obtained in the missing mass measurement with a good energy resolution of 2 MeV/c$^2$. A range counter array (RCA) was constructed to detect the two high-momentum protons from the $K^-pp$ decay and to reduce the background such as quasi-free hyperon production. Recently, we have carried out a pilot run in June, 2012. The $d(\pi^{+}, K^+)$ missing-mass spectrum has been obtained for the first time.

  45. Development of GEM-TPC with gating grid for J-PARC high intensity beam, 2

    Ichikawa, Yudai, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Sugimura, Hitoshi

    日本物理学会第67回年次大会　2012/03

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    J-PARC K1.8ビームラインにおいて、Cu標的による(K$^{-}$,K$^{+}$)反応を用いたH-dibaryon探索実験を計画している。本実験では106HzのK中間子ビームを想定しており、大強度K中間子ビームで実験を行うには107Hzのビームに対する耐性が必要な検出器が必須である。われわれはその大強度ビームに備えるためにゲート機能つきGEM-TPCの研究開発を行ってきた。本検出器では増幅部にGEMを用いる予定であり、50umと100umの厚さのGEMに対してAr:CF4(95:5)とP10ガスを用いてテストを行った。また、2011年11月に大阪大学核物理研究センターにおいて大強度ビームに対する耐性のテスト実験を行った。本講演ではGEMの性能評価及びRCNPで行った本検出器のテスト実験の結果を報告する。

  46. Design of spectrometer for H-dibaryon search at J-PARC

    Sako, Hiroyuki, Imai, Kenichi, Sato, Susumu, Sugimura, Hitoshi, Ichikawa, Yudai, Hasegawa, Shoichi, Shirotori, Kotaro, Kiuchi, Ryuta, Honda, Ryotaro

    日本物理学会第67回年次大会　2012/03

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    Recent Lattice-QCD calculations show the baryon-baryon potential corresponding to the H-dibaryon is attactive, and predicts H-dibaryon is either a weakly bound state or a resonance state. On the other hand, KEK-E224, E522 experiments observed a peak near the $\Lambda\Lambda$ invariant mass spectrum, which suggests existence of H-dibaryon. However, due to low statistics and low mass resolution, they did not discover the evidence for H-dibaryon. We propose an experiment (P-42) to search for H-dibaryon at J-PARC with $10^{6}$ Kaon beams with improved statistics and mass resolutions. In this experiment, a dipole magnet spectrometer based on high-rate capable GEM-TPC is designed to reconstruct 2 protons and to 2 $\pi^{-}$s decaying from a H-dibaryon.

  47. Search for a nuclear kaon bound state $K^-pp$ at the J-PARC K1.8 beam line International-presentation

    Ichikawa, Yudai, Imai, Kenichi, Nagae, Tomofumi, Fujioka, Hiroyuki, Tokiyasu, Atsushi

    Korea-Japan Workshop on Nuclear and Hadron Physics at J-PARC　2011/09

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    J-PARC K1.8ビームラインにおいて実験が予定されている最も単純なK中間子原子核である$K^-pp$束縛状態の探索実験であるJ-PARC E27実験の進行状況について発表する。J-PARC E27実験は液体重水素標的による($\pi^+$,$K^+$)反応を用いて$K^-pp$束縛状態を形成し、missing mass法を用いて$K^-pp$束縛状態の束縛エネルギー及び崩壊幅の測定を行う実験である。本実験ではさらに$K^-pp$束縛状態の崩壊から生じる二つの陽子を測定することにより$K^-pp$束縛状態であることを確認するのであるが、現在のJ-PARCのビーム強度では満足な統計量が得られない。そこで、実験の第一段階としてinclusive及び崩壊から生じる一つの陽子を検出した際のmissing massスペクトルを2012年春測定予定である。本講演では、2012年春予定しているデータ取得の目的及びSet upについて説明する。

  48. Development and performance evaluation of GEM-TPC for high intensity beam at J-PARC

    Sugimura, Hitoshi, Imai, Kenichi, Ichikawa, Yudai, Sato, Susumu, Sako, Hiroyuki

    日本物理学会2011年秋季大会(素粒子,核物理,宇宙線・宇宙物理)　2011/09

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    日本原子力研究開発機構にあるJ-PARCハドロン実験施設では10MHz以上の$\pi$中間子ビームが供給可能になりつつある。この大強度ビームに備えるため、新たにタイムプロジェクションチェンバー(TPC)を開発した。大きさは高さ300mm,幅100mm,厚さ100mmである。増幅部にはGEMを用い、大強度ビームでも電場の歪みを抑えるよう、GatingGridを用いることにした。東北大学電子光理学研究センターにおいて電子,陽電子ビームによる性能評価試験を行った。本講演ではこれまでの開発の経過と現在の状況について報告する。

  49. Development of GEM-TPC with gating grid for J-PARC hadron experiment International-presentation

    Sugimura, Hitoshi, Imai, Kenichi, Sako, Hiroyuki, Sato, Susumu, Ichikawa, Yudai

    2nd International Conference on Micro Pattern Gaseous Detectors (MPGD 2011)　2011/08

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    We are now developing a new time projection chamber (TPC) surrounding a target to measure the emitted particles of short flight lengths under a high beam rate. The prototype of the TPC with GEM readout has been developed. The effective area is about 100mm $\times$ 100mm $\times$ 300mm (drift direction) and Beam particles go through the TPC perpendicular to the drift direction. A signal is amplified with three layers of GEM sheet and read out with anode pads of various sizes for the study of the TPC properties. The goal of particle rate at the TPC is over $10^7$ Hz. In order to operate under such high counting rate, we adopted a gating grid opened by an appropriate trigger. We have tested the TPC by using an electron beam at the Research Center for Electron Photon Science, Tohoku University. We report the results of the test experiment.

  50. Result on the measurement of differential cross sections for $\Sigma^+ p$ elastic scattering in the J-PARC E40 experiment

    Nanamura Takuya, Tanida Kiyoshi, Ichikawa Yudai, Sako Hiroyuki, Sato Susumu, Hasegawa Shoichi, Yamamoto Takeshi, Fujita Manami

    日本物理学会2022年秋季大会(素粒子,核物理,宇宙線・宇宙物理)

  51. Study of Exotic hadron at J-PARC; HypTPC experiments and related topics

    Ichikawa Yudai

    エキゾチックハドロン研究会

  52. Study of exotic hadron at J-PARC

    Ichikawa Yudai

    エキゾチックハドロン研究会

  53. High resolution spectroscopy of the "$\Sigma$N cusp" at J-PARC (J-PARC P90) International-presentation

    Ichikawa Yudai

    14th International Conference on Hypernuclear and Strange Particle Physics (HYP 2022)

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    Recently, we have proposed a new experiment (J-PARC P90 experiment) to measure the missing-mass spectrum around the $\Sigma N$ threshold in the d(K$^{-}$, $\pi^{-}$) reaction at 1.4 GeV/c. A clear enhancement was observed near the $\Sigma$ N threshold, so called "$\Sigma$N cusp", for a long time ago. However, the dynamical origin of this enhancement remains unclear as yet. Especially, whether "$\Sigma$N cusp", is cusp or unstable bound state has not been determined yet. One of the key to make it clear is to improve the missing-mass resolution and statistics. In this experiment, we can achieve the missing-mass resolution of 0.4 MeV in $\sigma$ by using K1.8 beam line and S-2S spectrometers at J-PARC. Moreover, we will additionally install the time projection chamber (HypTPC), which was developed for the other J-PARC experiment (E42: H-dibaryon search), to suppress quasi-free backgrounds by detecting the charged tracks of the decay products. We can deduce the scattering length of $\Sigma$N system with isospin T = 1/2 and spin triplet channel in this experiment.

  54. Study of kaonic nuclei at J-PARC International-presentation

    Sako Hiroyuki, Tanida Kiyoshi, Hasegawa Shoichi, Sato Susumu, Ichikawa Yudai, Hayakawa Shuhei

    Strong QCD from Hadron Structure Experiments 2019; The Pre-workshop Reimei Symposium

  55. Preparation status of H dibaryon search experiment (J-PARC E42)

    Hayakawa Shuhei, Sako Hiroyuki, Ichikawa Yudai

    日本物理学会2019年秋季大会(素粒子,核物理,宇宙線・宇宙物理)

  56. Time Projection Chamber "HypTPC" for the hadron spectroscopy at J-PARC International-presentation

    Sako Hiroyuki, Tanida Kiyoshi, Hasegawa Shoichi, Sato Susumu, Ichikawa Yudai

    3rd J-PARC Symposium (J-PARC 2019)

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    We are developing Hyperon Spectrometer for the J PARC experiments. The Hyperon Spectrometer consists of a large acceptance super conductingdipole magne, a Time Projection Chamber (HypTPC and a TPC hodo scope). HypTPC measures the trajectory of charged particles in three dimension with high precision of 250 um. Then, we can achieve a good momentum resolution. By using this powerful detector, we propose three experiments at J PARC to search for the new hadronic state.

  57. Analysis status of $\Sigma^+ p$ scattering events in the J-PARC E40 experiment

    Nanamura Takuya, Ichikawa Yudai, Hayakawa Shuhei, Yoshida Junya, Miwa Koji*, Honda Ryotaro*, Akazawa Yuya*, Yamamoto Takeshi

    日本物理学会2019年秋季大会(素粒子,核物理,宇宙線・宇宙物理)

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    Hyperon-nucleon scattering experiment is one of the powerful methods for studying YN interaction. However, it is difficult due to short lifetime of hyperon. $\Sigma N$ scattering experiments were performed as KEK E251 and KEK E289 in order to measure the differential cross sections. In these experiments, statistics were limited to less than 100 events and differential cross section had too large statistical errors to restrict baryon-baryon interaction models. J-PARC E40 experiment aims for measuring cross sections of $\Sigma p$ scatterings with high statistics ($ \sim $10000 events) by overcoming difficulties of hyperon-nucleon scattering experiment. By using high rate ($\sim$ 19M /spill) $\pi$ beam and large acceptance spectrometer, we can produce and tag large amount of $\Sigma$ beam. LH$_2$ target and surrounding detector system CATCH enable us to reconstruct reactions from two body kinematics. Our experimental group completed $\Sigma^-$ data taking and about half of $\Sigma^+$ data taking by 2019 Apr. Left data taking will be performed in the end of this fiscal year.

  58. Development of the TPC hodoscope for the J-PARC E42/45 experiments, 2

    Sako Hiroyuki, Hasegawa Shoichi, Tanida Kiyoshi, Sato Susumu, Ichikawa Yudai

    日本物理学会第74回年次大会

  59. Result of $^{12}$C(K$^{-}$, p) analysis of the J-PARC E05 pilot run International-presentation

    Sako Hiroyuki, Tanida Kiyoshi, Hasegawa Shoichi, Sato Susumu, Ichikawa Yudai

    5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (Hawaii 2018)

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    We have measured a real inclusive missing-mass spectrum of the $^{12}$C(K$^{-}$, p) reactio at the kaon incident momentum of 1.8 GeV/c. This data was taken as a by-product measurement of the J-PARC E05 pilot run, which aim to search for the $\Xi$-hypernuclei by using $^{12}$C(K$^{-}$, K$^{+}$) reaction at J-PARC K1.8 beam line. We have compared the observed missing-mass spectrum with a DWIA calculation to discuss the K$^{bar}$-nucleus interaction. In this comparison, we have changed the depth of both real and imaginary part of the optical potential between K$^{bar}$ and nucleus. It is found that the observed spectrum is well reproduced by the calculation of the potential depth of V0 is about -80 MeV (real part) and W0 is about -40 MeV (imaginary part). On the other hand, we have observed the definitive excess in the deeply bound region BK $>$ 100 MeV. This excess cannot be explained by the any optical potential. Then, it can be interpreted as a deeply bound state between $\Lambda$(1405) and $^{10}$Be.

  60. Development of the S-2S spectrometer and the fiber target or high-resolution spectroscopic study of the $\Xi$-hypernuclei International-presentation

    Nanamura Takuya, Ichikawa Yudai, Nagae Tomofumi*, Ekawa Hiroyuki, Tanida Kiyoshi

    5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (Hawaii 2018)

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    Spectroscopic study of $\Xi$-hypernuclei provides insights into the $\Xi$-$N$ interaction and the $\Xi N \to \Lambda \Lambda$ coupling strength. A missing mass spectroscopy of the $\Xi$-hypernuclei was performed via the $^{12}$C$(K^-,K^+)$ reaction at J-PARC K1.8 beam line in 2015. In this measurement, we have achieved the missing mass resolution 5.4 MeV (FWHM). It is important to achieve a better missing mass resolution. As the next step, we are constructing a new spectrometer S-2S (Strangeness -2 Spectrometer) for the $K^+$. In this condition, the total missing-mass resolution would be affected mainly due to the target energy loss straggling. To reduce energy loss straggling in the target, we are developing an active target composed of scintillating fibers. We will present status of developments of these detectors.

  61. J-PARC E27 experiment to search for a $K^-pp$ bound state International-presentation

    Ichikawa Yudai

    2nd International Symposium on Science at J-PARC (J-PARC 2014)

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    An antikaon and a nucleus may form a bound state (a kaonic nucleus), due to the strong attraction of K$^{\rm bar}$-N in I=0. A $K^-pp$ bound state, which is the bound state of an antikaon and two nucleons, with the total charge +1 and the isospin 1/2, is expected to be the simplestkaonic nucleus. Various theoretical calculations for a $K^-pp$ bound state have been carried out and the existence of the bound state is supported in these calculations. However, the binding energy and the decay width depend on the K$^{\rm bar}$-N interactions and the calculation methods. Several experiments have been performed to look for a signal of kaonic nuclei. However, any firm experimental evidence has not been found. An experimental search for the $K^-pp$ bound state is performed by using the $d(\pi^+, K^+)$ reaction at J-PARCK 1.8 beam line (J-PARC E27 experiment). The first data taking as a pilot run was carried out in June, 2012. The missing-mass spectrum of this reaction studied at the beam momentum of 1.7 GeV/$c$, which allows the production of $\Lambda (1405)$, was obtained for the first time and a significant peak shift by $\sim$30 MeV was observed in the $Y^*$ region. In a preliminary proton-coincidence analysis, a sharp spike due to the $\Sigma N$-$\Lambda N$ coupling and a broad enhancement around 2.3 GeV/$c^2$, which might be attributed to the $K^-pp$ bound state, was clearly observed.

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Research Projects 5

  1. 反K中間子という新プローブで拓く原子核物理にとっての「New Physics」

    市川 裕大

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 国立研究開発法人日本原子力研究開発機構

    2021/04/01 - 2026/03/31

  2. A search for a new exotic hadron, Lambda(1665)

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Japan Atomic Energy Agency

    2021/04/05 - 2025/03/31

  3. HypTPCを用いた少数系K中間子クラスターK-pp, K-pppの研究

    市川 裕大

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 新学術領域研究(研究領域提案型)

    Institution: 国立研究開発法人日本原子力研究開発機構

    2021/04/01 - 2023/03/31

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    J-PARC K1.8ビームラインにおいて、KURAMAスペクトロメータとHypTPCを中心とするHyperonスペクトロメータを用いて、令和3年度にデータ取得を行った。 この実験では、キャリブレーション用にKURAMA電磁石ON/OFF、Hyperonスペクトロメータ用電磁石ON/OFFの状態で、Beam Throughのデータを取得した。このBeam Throughのデータを用いて、KURAMA Spectrometerの位置検出器とHypTPC検出器の位置のキャリブレーションを行うことができる。また、同様にスペクトロメータのキャリブレーションの為にCH2 標的のデータを取得した。キャリブレーションデータ取得後に、約30日の間、ダイヤモンド標的の物理データを取得した。 データ取得後は、Beam ThroughやCH2標的のデータなどを用いて、HypTPCのキャリブレーションを進めた。また、KURAMA スペクトロメータ側の解析も進め、p(K-, K+)Ξ-反応を用いて、Ξ粒子の生成率、Missing mass分解能を見積もり、スペクトロメータの健全性を評価した。 また、研究会等で、本研究計画に関する発表やPreliminaryな解析結果の報告を行った。

  4. Studies of baryons and dibaryons with J-PARC high-intensity meson beams and a TPC detector

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Japan Atomic Energy Agency

    2018/04/01 - 2023/03/31

  5. Development of the Time Projection Chamber to search for Kaonic nuclei

    Ichikawa Yudai, Sako Hiroyuki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Japan Atomic Energy Agency

    2016/04/01 - 2018/03/31

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    We develop the Time Projection Chamber "HypTPC". The main goal of this research is to improve the high rate capability of TPC more than 10＾7 Hz. We use the Gas Electron Multiplier (GEM) for the electron amplification. Here, we developed the new type GEM called as "Mask-GEM". In case of this "Mask-GEM" system, we can mask only the beam trajectory region. After installing the "Mask-GEM" to HypTPC, we carried out the test experiment at ELPH by using positron beam. Then, we confirmed that "Mask-GEM" worked well. In July of 2018, we will do the final test experiment at HIMAC by using proton beam.