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Koichi Ichimura

Section

Research Center for Neutrino Science

Job title

Associate Professor

Degree

博士（理学）（東北大学）
修士（理学）（東北大学）

researchmap

https://researchmap.jp/6N5YULHO

J-GLOBAL ID

201801008331206619

e-Rad No.

80600064

Research History 7

2025/04 - Present

Tohoku University　Research Center for Neutrino Science　Associate Professor
2020/02 - 2025/03

Tohoku University　Research Center for Neutrino Science　Assistant Professor
2013/08 - 2020/01

nstitute for Cosmic Ray Research, The University of Tokyo　Research Assistant Professor
2010/11 - 2013/07

Research Center for Nuclear Physics, Osaka University　Specially Appointed Researcher
2010/04 - 2010/10

Research Center for Neutrino Science, Tohoku University　Postdoctoral Fellow
2008/04 - 2010/03

UC Berkeley　Postdoctoral Fellowt
2006/04 - 2008/03

JSPS　JSPS Research Fellowship (DC2)

Show all Show first 5

Education 3

Tohoku Unicersity

2005/04 - 2008/03
東北大学大学院　理学研究科　博士課程前期2年

2003/04 - 2005/03
Tohoku University　Faculty of Science　Department of Physics

1999/04 - 2003/03

Committee Memberships 2

物理学実験担当者会議 (専攻内委員会)　学内委員

2022/04 - 2024/03
The Physical Society of Japan　Organizing Committee

2023/09 - 2023/09

Professional Memberships 1

日本物理学会

Research Interests 3

極低放射能技術
dark matter
neutrino

Research Areas 1

Natural sciences / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics /

Awards 4

総長賞

2008/03　東北大学
Oral Presentation Award

2007/02　東北大学 21世紀COEプログラム
総長賞

2003/03　東北大学
青葉山理学振興会奨励賞

2002/03　東北大学

Papers 81

Limits on the Low-energy Electron Antineutrino Flux from the Brightest Gamma-Ray Burst of All Time Peer-reviewed

S. Abe, T. Araki, S. Chauhan, K. Chiba, T. Eda, M. Eizuka, Y. Funahashi, A. Furuto, A. Gando, Y. Gando, S. Goto, T. Hachiya, K. Hata, K. Ichimura, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, A. Marthe, Y. Matsumoto, T. Mitsui, H. Miyake, D. Morita, R. Nakajima, K. Nakamura, R. Nakamura, R. Nakamura, J. Nakane, T. Ono, H. Ozaki, K. Saito, T. Sakai, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, K. Tachibana, K. Tamae, H. Watanabe, K. Watanabe, S. Kurosawa, Y. Urano, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, Z. Fu, S. Ghosh, J. Smolsky, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Dell’Oro, T. O’Donnell, J. A. Detwiler, S. Enomoto, M. P. Decowski, K. M. Weerman, C. Grant, Ö. Penek, H. Song, A. Li, S. N. Axani, M. Garcia, M. Sarfraz

The Astrophysical Journal　981　(2)　192-192　2025/03/07
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ad9c36 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract The electron antineutrino flux limits are presented for the brightest gamma-ray burst (GRB) of all time, GRB221009A, over a range of 1.8–200 MeV using the Kamioka Liquid Scintillator Antineutrino Detector. Using multiple time windows ranging from minutes to days surrounding the event to search for electron antineutrinos coincident with the GRB, we set an upper limit on the flux under the assumption of several power-law neutrino source spectra, with power-law indices ranging from 1.5 to 3 in steps of 0.5. No excess was observed in any time windows ranging from seconds to days around the event trigger time T ₀. For a power-law index of 2 and a time window of T ₀ ± 500 s, a flux upper limit of 2.34 × 10⁹ cm⁻² was calculated. The limits are compared to the results presented by IceCube.
Development of a low-background micro-pixel chamber for directional dark matter searches Peer-reviewed

Ryota Namai, Satoshi Higashino, Hirohisa Ishiura, Tomonori Ikeda, Mizuno Ofuji, Ayaka Nakayama, Ryo Kubota, Kiseki D. Nakamura, Hiroshi Ito, Koichi Ichimura, Ko Abe, Kazuyoshi Kobayashi, Atsushi Takada, Kentaro Miuchi

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　1072　170145-170145　2025/03
Publisher: Elsevier BV
DOI： 10.1016/j.nima.2024.170145 　

ISSN： 0168-9002
CANDLES-III detector: Low-background spectrometer for studying neutrino-less double beta decay of 48Ca Peer-reviewed

S. Ajimura, K. Akutagawa, T. Batpurev, F. Doukaku, K. Fushimi, R. Hazama, K. Ichimura, T. Iida, H. Kakubata, K. Kanagawa, S. Katagiri, B.T. Khai, T. Kishimoto, X. Li, T. Maeda, A. Masuda, K. Matsuoka, K. Mizukoshi, K. Morishita, K. Nakajima, N. Nakatani, M. Nomachi, I. Ogawa, T. Ohata, A. Rittirong, M. Saka, K. Suzuki, N. Takahashi, Y. Takemoto, Y. Takihira, Y. Tamagawa, K. Tetsuno, M. Tozawa, V.T.T. Trang, M. Tsuzuki, T. Uehara, S. Umehara, K. Yasuda, S. Yoshida, M. Yoshizawa, N. Yotsunaga

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　1069　169982-169982　2024/12
Publisher: Elsevier BV
DOI： 10.1016/j.nima.2024.169982 　

ISSN： 0168-9002
Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande Peer-reviewed

S. Abe, M. Eizuka, S. Futagi, A. Gando, Y. Gando, S. Goto, T. Hachiya, K. Hata, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, T. Mitsui, H. Miyake, D. Morita, T. Nakahata, R. Nakajima, K. Nakamura, R. Nakamura, R. Nakamura, J. Nakane, H. Ozaki, K. Saito, T. Sakai, I. Shimizu, J. Shirai, K. Shiraishi, R. Shoji, A. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, K. Watanabe, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, Z. Fu, J. Smolsky, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Dell’Oro, T. O’Donnell, J. A. Detwiler, S. Enomoto, M. P. Decowski, K. M. Weerman, C. Grant, H. Song, A. Li, S. N. Axani, M. Garcia, K. Abe, S. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, R. Rogly, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, G. Pronost, C. Fujisawa, S. Horiuchi, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, A. Portocarrero Yrey, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, W. Shi, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, A. Q. Zhang, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, R. Shibayama, S. Suzuki

The Astrophysical Journal　973　(2)　140-140　2024/09/26
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ad5fee 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract Preceding a core-collapse supernova (CCSN), various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially detectable by terrestrial neutrino experiments such as KamLAND and Super-Kamiokande (SK) via inverse beta decay interactions. Once these pre-supernova (pre-SN) neutrinos are observed, an early warning of the upcoming CCSN can be provided. In light of this, KamLAND and SK, both located in the Kamioka mine in Japan, have been monitoring pre-SN neutrinos since 2015 and 2021, respectively. Recently, we performed a joint study between KamLAND and SK on pre-SN neutrino detection. A pre-SN alert system combining the KamLAND detector and the SK detector was developed and put into operation, which can provide a supernova alert to the astrophysics community. Fully leveraging the complementary properties of these two detectors, the combined alert is expected to resolve a pre-SN neutrino signal from a 15 M _⊙ star within 510 pc of the Earth at a significance level corresponding to a false alarm rate of no more than 1 per century. For a Betelgeuse-like model with optimistic parameters, it can provide early warnings up to 12 hr in advance.
Search for charged excited states of dark matter with KamLAND-Zen Peer-reviewed

S. Abe, M. Eizuka, S. Futagi, A. Gando, Y. Gando, S. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, T. Mitsui, H. Miyake, D. Morita, T. Nakahata, R. Nakajima, K. Nakamura, R. Nakamura, R. Nakamura, J. Nakane, H. Ozaki, T. Sakai, I. Shimizu, J. Shirai, K. Shiraishi, R. Shoji, A. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, K. Watanabe, S. Obara, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, A. Ichikawa, B.E. Berger, B.K. Fujikawa, J.G. Learned, J. Maricic, S.N. Axani, Z. Fu, J. Smolsky, L.A. Winslow, Y. Efremenko, H.J. Karwowski, D.M. Markoff, W. Tornow, S. Dell'Oro, T. O'Donnell, J.A. Detwiler, S. Enomoto, M.P. Decowski, K.M. Weerman, C. Grant, A. Li, H. Song

Physics Letters B　855　138846-138846　2024/08
Publisher: Elsevier BV
DOI： 10.1016/j.physletb.2024.138846 　

ISSN： 0370-2693
Development of a Method to Measure Trace Levels of Uranium and Thorium in Scintillation Films Peer-reviewed

K Ichimura, K Chiba, Y Gando, H Ikeda, Y Kishimoto, M Kurasawa, K Nemoto, A Sakaguchi, Y Takaku, Y Sakakieda

Progress of Theoretical and Experimental Physics　2024　(6)　2024/05/10
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptae071 　

eISSN： 2050-3911

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Abstract We have established a method to measure picograms-per-gram (pg g−1) levels of 238U and 232Th in scintillation films by combining the dry ashing method and inductively coupled plasma mass spectrometry. Trace amounts of 238U and 232Th were measured in up to 2 g of scintillation film with almost 100% collection efficiency. This paper details the experimental procedure, including the pretreatment of the samples and labware, detection limit of the method, collection efficiencies of 238U and 232Th, and measurement of 238U and 232Th in a polyethylene naphthalate film. This method is also applicable to 238U and 232Th measurements in other low-background organic materials for rare-event search experiments.
(Proceedings) Application of gamma Transition-Edge-Sensor (TES) to $^{112}$Sn two-neutrino double electron capture search Peer-reviewed

Koichi Ichimura, Koji Ishidoshiro, Azusa Gando, Kaori Hattori, Takahiro Kikuchi, Hirotake Yamamori, Shinya Yamada, Tadafumi Kishimoto

Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics — PoS(TAUP2023)　2024/03/22
Publisher: Sissa Medialab
DOI： 10.22323/1.441.0267 　
Development of a low-background HPGe detector at Kamioka Observatory Peer-reviewed

K Ichimura, H Ikeda, Y Kishimoto, M Kurasawa, A A Suzuki, Y Gando, M Ikeda, K Hosokawa, H Sekiya, H Ito, A Minamino, S Suzuki

Progress of Theoretical and Experimental Physics　2023/11/08
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptad136 　

eISSN： 2050-3911

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Abstract A new ultra-low background high-purity germanium (HPGe) detector has been installed at the Kamioka underground experimental site. The background count rate in the energy range from 40 keV to 2700 keV is about 25% lower than that of the first HPGe detector installed in 2016, which has the same detector specification and similar shielding geometry. This paper describes the shielding configuration, including the cleaning of the material surface, the comparison of calibration data and simulation, the time variation of the background spectra, the sample measurement procedure, and some results of the radioactivity in the selected samples.
Direct dark matter searches with the full data set of XMASS-I Peer-reviewed

K. Abe, K. Hiraide, N. Kato, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, Y. Suzuki, A. Takeda, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. H. Kim, Y. Itow, K. Martens, A. Mason, M. Yamashita, K. Miuchi, Y. Takeuchi, K. B. Lee, M. K. Lee, Y. Fukuda, H. Ogawa, K. Ichimura, Y. Kishimoto, K. Nishijima, K. Fushimi, B. D. Xu, K. Kobayashi, S. Nakamura

Physical Review D　108　(8)　2023/10/17
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevd.108.083022 　

ISSN： 2470-0010

eISSN： 2470-0029
Direction-sensitive dark matter search with 3D-vector-type tracking in NEWAGE Peer-reviewed

Takuya Shimada, Satoshi Higashino, Tomonori Ikeda, Kiseki Nakamura, Ryota Yakabe, Takashi Hashimoto, Hirohisa Ishiura, Takuma Nakamura, Miki Nakazawa, Ryo Kubota, Ayaka Nakayama, Hiroshi Ito, Koichi Ichimura, Ko Abe, Kazuyoshi Kobayashi, Toru Tanimori, Hidetoshi Kubo, Atsushi Takada, Hiroyuki Sekiya, Atsushi Takeda, Kentaro Miuchi

Progress of Theoretical and Experimental Physics　2023　(10)　2023/10/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptad120 　

eISSN： 2050-3911

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Abstract NEWAGE is a direction-sensitive dark matter search experiment with a 3D tracking detector based on a gaseous micro time projection chamber. A direction-sensitive dark matter search was carried out at Kamioka Observatory with a total live time of 318.0 days resulting in an exposure of 3.18 kg·days. A new gamma-ray rejection and a head–tail determination analysis were implemented for this work. No significant non-isotropic signal from the directional analysis was found and a 90% confidence level upper limit on a spin-dependent weakly interactive massive particle (WIMP)–proton cross section of 25.7 pb for a WIMP mass of 150 GeV/c2 was derived. This analysis marks the most stringent upper limit in the direction-sensitive dark matter searches.
Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND Peer-reviewed

S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, Z. Fu, J. Smolsky, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Dell'Oro, T. O'Donnell, J. A. Detwiler, S. Enomoto, M. P. Decowski, K. M. Weerman, C. Grant, A. Li, H. Song

Physical Review C　107　(5)　2023/05/22
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevc.107.054612 　

ISSN： 2469-9985

eISSN： 2469-9993
First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND Peer-reviewed

S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, Z. Fu, J. Smolsky, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, A. Li, H. Song, S. Dell’Oro, T. O’Donnell

Physical Review D　107　(7)　2023/04/19
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevd.107.072006 　

ISSN： 2470-0010

eISSN： 2470-0029
(Proceedings) Recent results from KamLAND-Zen Invited Peer-reviewed

Koichi Ichimura

Proceedings of Neutrino Oscillation Workshop — PoS(NOW2022)　2023/03/28
Publisher: Sissa Medialab
DOI： 10.22323/1.421.0067 　
Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen Peer-reviewed

S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, S. Hayashida, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, N. Maemura, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, K. Ueshima, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, D. Chernyak, A. Kozlov, K. Z. Nakamura, S. Yoshida, Y. Takemoto, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, J. Smolsky, Z. Fu, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Dell’Oro, T. O’Donnell, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, A. Li, H. Song

Physical Review Letters　130　(5)　2023/01/30
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevlett.130.051801 　

ISSN： 0031-9007

eISSN： 1079-7114
Development of ultra-pure gadolinium sulfate for the Super-Kamiokande gadolinium project Peer-reviewed

K Hosokawa, M Ikeda, T Okada, H Sekiya, P Fernández, L Labarga, I Bandac, J Perez, S Ito, M Harada, Y Koshio, M D Thiesse, L F Thompson, P R Scovell, E Meehan, K Ichimura, Y Kishimoto, Y Nakajima, M R Vagins, H Ito, Y Takaku, Y Tanaka, Y Yamaguchi

Progress of Theoretical and Experimental Physics　2023　(1)　2023/01/10
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptac170 　

eISSN： 2050-3911

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Abstract This paper reports the development and detailed properties of about 13 metric tons of gadolinium sulfate octahydrate, $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$, which has been dissolved into Super-Kamiokande (SK) in the summer of 2020. We evaluate the impact of radioactive impurities in $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$ on diffuse supernova neutrino background searches and solar neutrino observation and confirm the need to reduce radioactive and fluorescent impurities by about three orders of magnitude from commercially available high-purity $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$. In order to produce ultra-high-purity $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$, we have developed a method to remove impurities from gadolinium oxide, Gd2O3, consisting of acid dissolution, solvent extraction, and pH control processes, followed by a high-purity sulfation process. All of the produced ultra-high-purity $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$ is assayed by inductively coupled plasma mass spectrometry and high-purity germanium detectors to evaluate its quality. Because of the long measurement time of high-purity germanium detectors, we have employed several underground laboratories for making parallel measurements including the Laboratorio Subterráneo de Canfranc in Spain, Boulby in the UK, and Kamioka in Japan. In the first half of production, the measured batch purities were found to be consistent with the specifications. However, in the latter half, the $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$ contained one order of magnitude more 228Ra than the budgeted mean contamination. This was correlated with the corresponding characteristics of the raw material Gd2O3, in which an intrinsically large contamination was present. Based on their modest impact on SK physics, they were nevertheless introduced into the detector. To reduce 228Ra for the next stage of gadolinium loading to SK, a new process has been successfully established.
Search for neutrinoless quadruple beta decay of 136Xe in XMASS-I Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, N. Kato, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y.H. Kim, R. Ishii, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, A. Mason, Y. Suzuki, K. Miuchi, Y. Takeuchi, K.B. Lee, M.K. Lee, Y. Fukuda, H. Ogawa, K. Nishijima, K. Fushimi, B.D. Xu, S. Nakamura

Physics Letters B　833　137355-137355　2022/10
Publisher: Elsevier BV
DOI： 10.1016/j.physletb.2022.137355 　

ISSN： 0370-2693
KamLAND’s search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube

S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, T. Kinoshita, M. Koga, M. Kurasawa, N. Maemura, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, Y. Yoshida, S. Obara, A.K. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B.E. Berger, B.K. Fujikawa, J.G. Learned, J. Maricic, S.N. Axani, J. Smolsky, J. Lertprasertpong, L.A. Winslow, Z. Fu, J. Ouellet, Y. Efremenko, H.J. Karwowski, D.M. Markoff, W. Tornow, A. Li, J.A. Detwiler, S. Enomoto, M.P. Decowski, C. Grant, H. Song, T. O’Donnell, S. Dell’Oro

Astroparticle Physics　143　102758-102758　2022/10
Publisher: Elsevier BV
DOI： 10.1016/j.astropartphys.2022.102758 　

ISSN： 0927-6505
Abundances of uranium and thorium elements in Earth estimated by geoneutrino spectroscopy Peer-reviewed

S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, N. Maemura, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, Y. Shirahata, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, Z. Fu, J. Smolsky, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, A. Li, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, H. Song, T. O’Donnell, S. Dell’Oro

Geophysical Research Letters　49　(16)　2022/08/11
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2022gl099566 　

ISSN： 0094-8276

eISSN： 1944-8007

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Abstract The decay of the primordial isotopes ²³⁸U, ²³⁵U, ²³²Th, and ⁴⁰K has contributed to the terrestrial heat budget throughout the Earth's history. Hence, the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth models. The geoneutrinos produced by the radioactive decays of uranium and thorium have been observed with the Kamioka Liquid‐Scintillator Antineutrino Detector (KamLAND). Those measurements have been improved with more than 18‐year observation time, and improvement in detector background levels mainly with an 8‐year nearly reactor‐free period, which now permit spectroscopy with geoneutrinos. Our results yield the first constraint on both uranium and thorium heat contributions. The KamLAND result is consistent with geochemical estimations based on elemental abundances of chondritic meteorites and mantle peridotites. The High‐Q model is disfavored at 99.76% C.L. and a fully radiogenic model is excluded at 5.2σ assuming a homogeneous heat producing element distribution in the mantle.
Search for Supernova Neutrinos and Constraint on the Galactic Star Formation Rate with the KamLAND Data

S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, N. Maemura, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, Y. Yoshida, S. Obara, A. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, L. A. Winslow, Z. Fu, J. Smolsky, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, A. Li, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, H. Song, T. O’Donnell, S. Dell’Oro

The Astrophysical Journal　934　(1)　85-85　2022/07/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ac7a3f 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract We present the results of a search for core-collapse supernova neutrinos, using long-term KamLAND data from 2002 March 9 to 2020 April 25. We focus on the electron antineutrinos emitted from supernovae in the energy range of 1.8–111 MeV. Supernovae will make a neutrino event cluster with the duration of ∼10 s in the KamLAND data. We find no neutrino clusters and give the upper limit on the supernova rate to be 0.15 yr⁻¹ with a 90% confidence level. The detectable range, which corresponds to a >95% detection probability, is 40–59 kpc and 65–81 kpc for core-collapse supernovae and failed core-collapse supernovae, respectively. This paper proposes to convert the supernova rate obtained by the neutrino observation to the Galactic star formation rate. Assuming a modified Salpeter-type initial mass function, the upper limit on the Galactic star formation rate is <(17.5–22.7) M_⊙ yr⁻¹ with a 90% confidence level.
A Search for Correlated Low-energy Electron Antineutrinos in KamLAND with Gamma-Ray Bursts Peer-reviewed

S. Abe, S. Asami, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, T. Kinoshita, M. Koga, N. Maemura, T. Mitsui, H. Miyake, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, M. Eizuka, M. Kurasawa, T. Nakahata, S. Futagi, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, J. Smolsky, C. Laber-Smith, L. A. Winslow, Z. Fu, J. Ouellet, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, A. Li, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, H. Song, T. O’Donnell, S. Dell’Oro

The Astrophysical Journal　927　(1)　69-69　2022/03/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ac4e7e 　

ISSN： 0004-637X

eISSN： 1538-4357
Limits on Astrophysical Antineutrinos with the KamLAND Experiment Peer-reviewed

S. Abe, S. Asami, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, S. Hayashida, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, T. Kinoshita, M. Koga, N. Maemura, T. Mitsui, H. Miyake, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, Y. Shirahata, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, K. Ueshima, Y. Wada, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, A. Kozlov, D. Chernyak, Y. Takemoto, S. Yoshida, S. Umehara, K. Fushimi, S. Hirata, K. Z. Nakamura, M. Yoshida, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, L. A. Winslow, Z. Fu, J. Ouellet, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, A. Li, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, T. O’Donnell, S. Dell’Oro

The Astrophysical Journal　925　(1)　14-14　2022/01/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ac32c1 　

ISSN： 0004-637X

eISSN： 1538-4357
Search for Solar Flare Neutrinos with the KamLAND Detector Peer-reviewed

S. Abe, S. Asami, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, S. Hayashida, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, T. Kinoshita, M. Koga, N. Maemura, T. Mitsui, H. Miyake, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, K. Ueshima, Y. Wada, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, A. Kozlov, D. Chernyak, Y. Takemoto, S. Yoshida, S. Umehara, K. Fushimi, K. Z. Nakamura, M. Yoshida, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, L. A. Winslow, Z. Fu, J. Ouellet, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, A. Li, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, T. O’Donnell, S. Dell’Oro

The Astrophysical Journal　924　(2)　103-103　2022/01/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ac35d1 　

ISSN： 0004-637X

eISSN： 1538-4357
Precise measurement of the scintillation decay constant of the ZnWO₄crystal Peer-reviewed

Shibata, M., Sekiya, H., Ichimura, K.

Progress of Theoretical and Experimental Physics　2022　(1)　2022
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptab132 　

eISSN： 2050-3911
Low-energy astrophysics with KamLAND

Nanami Kawada, Shuhei Obara, Koji Ishidoshiro, Seisho Abe, Sachihiro Asami, Azusa Gando, Yoshihito Gando, Tomomi Gima, Anna Goto, Takahiko Hachiya, Kazumi Hata, Shingo Hayashida, Keishi Hosokawa, Koichi Ichimura, Sei Ieki, Haruo Ikeda, Kunio Inoue, Yuto Kamei, Yasuhiro Kishimoto, Tatsuya Kinoshita, Masayuki Koga, Naoya Maemura, Tadao Mitsui, Haruhiko Miyake, Kengo Nakamura, Kosuke Nakamura, Rikuo Nakamura, Hideyoshi Ozaki, Taichi Sakai, Hiroto Sambonsugi, Itaru Shimizu, Junpei Shirai, Kensuke Shiraishi, Atsuto SUZUKI, Yuya Suzuki, Atsuto Takeuchi, Kyoko Tamae, Kota Ueshima, Yoshiki Wada, Hiroko Watanabe, Yuki Yoshida, Atsuko Ichikawa, Alexandre Kozlov, Dmitry CHERNYAK, Yasuhiro Takemoto, Sei Yoshida, Saori Umehara, Ken-Ichi Fushimi, Kazuhiro Nakamura, Masashi Yoshida, Bruce Edmond Berger, Brian Kurt Fujikawa, John Gregory Learned, Jelena Maricic, Spencer N. Axani, Lindley Anne Winslow, Zhenghao Fu, Jonathan Ouellet, Yuri Efremenko, Hugon J. Karwowski, Dian M. Markoff, Werner Tornow, Aobo Li, Jason A. Detwiler, Sanshiro Enomoto, Patric Decowski, Chistopher Grant, Thomas O'Donnell, Stefano Dell'Oro

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)　2021/07/29
Publisher: Sissa Medialab
DOI： 10.22323/1.395.1163 　
Direction-sensitive dark matter search with the low-background gaseous detector NEWAGE-0.3b Peer-reviewed

Ikeda, T., Nakamura, K., Shimada, T., Yakabe, R., Hashimoto, T., Ishiura, H., Nakamura, T., Ito, H., Ichimura, K., Abe, K., Kobayashi, K., Tanimori, T., Kubo, H., Takada, A., Sekiya, H., Takeda, A., Miuchi, K.

Progress of Theoretical and Experimental Physics　2021　(6)　2021/06/18
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptab053 　

ISSN： 2050-3911

eISSN： 2050-3911
Low background measurement in CANDLES-III for studying the neutrinoless double beta decay of Ca48 Peer-reviewed

S. Ajimura, W. M. Chan, K. Ichimura, T. Ishikawa, K. Kanagawa, B. T. Khai, T. Kishimoto, H. Kino, T. Maeda, K. Matsuoka, N. Nakatani, M. Nomachi, M. Saka, K. Seki, Y. Takemoto, Y. Takihira, D. Tanaka, M. Tanaka, K. Tetsuno, V. T. T. Trang, M. Tsuzuki, S. Umehara, K. Akutagawa, T. Batpurev, M. Doihara, S. Katagiri, E. Kinoshita, Y. Hirano, T. Iga, M. Ishikawa, G. Ito, H. Kakubata, K. K. Lee, X. Li, K. Mizukoshi, M. Moser, T. Ohata, M. Shokati, M. S. Soberi, T. Uehara, W. Wang, K. Yamamoto, K. Yasuda, S. Yoshida, N. Yotsunaga, T. Harada, H. Hiraoka, T. Hiyama, A. Hirota, Y. Ikeyama, A. Kawamura, Y. Kawashima, S. Maeda, K. Matsuoka, K. Nakajima, I. Ogawa, K. Ozawa, K. Shamoto, K. Shimizu, Y. Shinki, Y. Tamagawa, M. Tozawa, M. Yoshizawa, K. Fushimi, R. Hazama, P. Noithong, A. Rittirong, K. Suzuki, T. Iida

Physical Review D　103　(9)　2021/05/26
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevd.103.092008 　

ISSN： 2470-0010

eISSN： 2470-0029
Search for event bursts in XMASS-I associated with gravitational-wave events Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, H. Ogawa, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, Y. Suzuki, B.D. Xu, K. Miuchi, N. Oka, Y. Takeuchi, Y.H. Kim, K.B. Lee, M.K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, K. Fushimi, G. Kanzaki, S. Nakamura

Astroparticle Physics　129　102568-102568　2021/05
Publisher: Elsevier BV
DOI： 10.1016/j.astropartphys.2021.102568 　

ISSN： 0927-6505
Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events Peer-reviewed

S. Abe, S. Asami, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, S. Hayashida, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, T. Kinoshita, M. Koga, N. Maemura, T. Mitsui, H. Miyake, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, K. Ueshima, Y. Wada, H. Watanabe, Y. Yoshida, S. Obara, A. Kozlov, D. Chernyak, Y. Takemoto, S. Yoshida, S. Umehara, K. Fushimi, A. K. Ichikawa, K. Z. Nakamura, M. Yoshida, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, L. A. Winslow, Z. Fu, J. Ouellet, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, A. Li, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, T. O’Donnell, S. Dell’Oro

The Astrophysical Journal　909　(2)　116-116　2021/03/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/abd5bc 　

ISSN： 0004-637X

eISSN： 1538-4357
Supernova-scope for the direct search of Supernova axions Peer-reviewed

Ge, S.-F., Hamaguchi, K., Ichimura, K., Ishidoshiro, K., Kanazawa, Y., Kishimoto, Y., Nagata, N., Zheng, J.

Journal of Cosmology and Astroparticle Physics　2020　(11)　059-059　2020/11/27
Publisher: IOP Publishing
DOI： 10.1088/1475-7516/2020/11/059 　

ISSN： 1475-7516

eISSN： 1475-7516
Evaluation of radon adsorption efficiency values in xenon with activated carbon fibers Peer-reviewed

Y Nakano, K Ichimura, H Ito, T Okada, H Sekiya, Y Takeuchi, S Tasaka, M Yamashita

Progress of Theoretical and Experimental Physics　2020　(11)　2020/11/13
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptaa119 　

eISSN： 2050-3911
Development of a dual-phase xenon TPC with a quartz chamber for direct dark matter searches Peer-reviewed

Kazufumi Sato, Masaki Yamashita, Koichi Ichimura, Yoshitaka Itow, Shingo Kazama, Shigetaka Moriyama, Kosuke Ozaki, Takumi Suzuki, Rina Yamazaki

Progress of Theoretical and Experimental Physics　2020　(11)　2020/11/13
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptaa141 　

eISSN： 2050-3911
Search for exotic neutrino-electron interactions using solar neutrinos in XMASS-I Peer-reviewed

K. Abe, Y. Chen, K. Hiraide, K. Ichimura, S. Imaizumi, N. Kato, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y.H. Kim, R. Ishii, Y. Itow, K. Kanzawa, K. Martens, A. Mason, Y. Suzuki, K. Miuchi, Y. Takeuchi, K.B. Lee, M.K. Lee, Y. Fukuda, H. Ogawa, Y. Kishimoto, K. Nishijima, K. Fushimi, B.D. Xu, S. Nakamura

Physics Letters B　809　135741-135741　2020/10
Publisher: Elsevier BV
DOI： 10.1016/j.physletb.2020.135741 　

ISSN： 0370-2693
Development of a low-α-emitting μ-PIC as a readout device for direction-sensitive dark matter detectors Peer-reviewed

Takashi Hashimoto, Kentaro Miuchi, Tomonori Ikeda, Hirohisa Ishiura, Kiseki D. Nakamura, Hiroshi Ito, Koichi Ichimura, Ko Abe, Kazuyoshi Kobayashi, Atsushi Takada, Atsuhiko Ochi, Takuma Nakamura, Takuya Shimada

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　977　164285-164285　2020/10
Publisher: Elsevier BV
DOI： 10.1016/j.nima.2020.164285 　

ISSN： 0168-9002
Development of low-background photomultiplier tubes for liquid xenon detectors Peer-reviewed

K. Abe, Y. Chen, K. Hiraide, K. Ichimura, S. Imaizumi, N. Kato, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y.H. Kim, R. Ishii, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, A. Mason, Y. Suzuki, K. Miuchi, Y. Takeuchi, K.B. Lee, M.K. Lee, Y. Fukuda, H. Ogawa, K. Nishijima, K. Fushimi, B.D. Xu, S. Nakamura

Journal of Instrumentation　15　(09)　P09027-P09027　2020/09/18
Publisher: IOP Publishing
DOI： 10.1088/1748-0221/15/09/p09027 　

eISSN： 1748-0221
Improved method for measuring low-concentration radium and its application to the Super-Kamiokande Gadolinium project Peer-reviewed

Ito, S., Ichimura, K., Takaku, Y., Abe, K., Harada, M., Ikeda, M., Ito, H., Kishimoto, Y., Nakajima, Y., Okada, T., Sekiya, H.

Progress of Theoretical and Experimental Physics　2020　(9)　2020/09/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptaa105 　

ISSN： 2050-3911

eISSN： 2050-3911
Measurement of the Anisotropic Response of the ZnWO₄Crystal for Developing the Direction-Sensitive Dark Matter Detector Peer-reviewed

Ichimura, K., Sekiya, H., Pedersen, J.W., Yamaji, A., Kurosawa, S.

IEEE Transactions on Nuclear Science　67　(6)　894-897　2020/06
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/TNS.2020.2985027 　

ISSN： 0018-9499

eISSN： 1558-1578
High-light-yield calcium iodide (CaI2) scintillator for astroparticle physics Peer-reviewed

Takashi Iida, Kei Kamada, Masao Yoshino, Kyoung Jin Kim, Koichi Ichimura, Akira Yoshikawa

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　958　162629-162629　2020/04

DOI： 10.1016/j.nima.2019.162629 　

ISSN： 0168-9002

eISSN： 1872-9576
A measurement of the scintillation decay time constant in liquid xenon with the XMASS-I detector Peer-reviewed

K. Ichimura, for theXMASS Collaboration

Journal of Physics: Conference Series　1468　(1)　012235　2020/03/20

DOI： 10.1088/1742-6596/1468/1/012235 　
Anisotropic response measurements of ZnWO₄ scintillators to neutrons for developing a direction-sensitive dark matter detector Peer-reviewed

Pedersen, J.W., Sekiya, H., Ichimura, K.

Progress of Theoretical and Experimental Physics　2020　(2)　023C01　2020/02/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptz168 　

eISSN： 2050-3911
Search for sub-GeV dark matter by annual modulation using XMASS-I detector Peer-reviewed

M. Kobayashi, K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, S. Moriyama, M. Nakahata, H. Ogawa, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, Y. Suzuki, B.D. Xu, K. Miuchi, N. Oka, Y. Takeuchi, Y.H. Kim, K.B. Lee, M.K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, K. Fushimi, G. Kanzaki, S. Nakamura

Physics Letters B　795　308-313　2019/08
Publisher: Elsevier BV
DOI： 10.1016/j.physletb.2019.06.022 　

ISSN： 0370-2693
Search for WIMP-129Xe inelastic scattering with particle identification in XMASS-I Peer-reviewed

T. Suzuki, K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, H. Ogawa, K. Sato, H. Sekiya, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, Y. Suzuki, B.D. Xu, K. Miuchi, N. Oka, Y. Takeuchi, Y.H. Kim, K.B. Lee, M.K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, K. Fushimi, G. Kanzaki, S. Nakamura

Astroparticle Physics　110　1-7　2019/07
Publisher: Elsevier BV
DOI： 10.1016/j.astropartphys.2019.02.007 　

ISSN： 0927-6505
Development of a time projection chamber with a sheet-resistor field cage Peer-reviewed

Kentaro Miuchi, Tomonori Ikeda, Hirohisa Ishiura, Kiseki D Nakamura, Atsushi Takada, Yasuhiro Homma, Ko Abe, Koichi Ichimura, Hiroshi Ito, Kazuyoshi Kobayashi, Takuma Nakamura, Ryuichi Ueno, Takuya Shimada, Takashi Hashimoto, Ryota Yakabe, Atsuhiko Ochi

Progress of Theoretical and Experimental Physics　2019　(6)　2019/06/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/ptz048 　

eISSN： 2050-3911
Development of low radioactivity photomultiplier tubes for the XMASS-I detector Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, K. Sato, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, R. Kegasa, K. Masuda, H. Takiya, K. Fushimi, G. Kanzaki, K. Martens, Y. Suzuki, B.D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Takeuchi, Y.H. Kim, K.B. Lee, M.K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, S. Nakamura

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　922　171-176　2019/04
Publisher: Elsevier BV
DOI： 10.1016/j.nima.2018.12.083 　

ISSN： 0168-9002
A direct dark matter search in XMASS-I Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, K. Sato, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, R. Kegasa, K. Masuda, H. Takiya, K. Fushimi, G. Kanzaki, K. Martens, Y. Suzuki, B.D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Takeuchi, Y.H. Kim, K.B. Lee, M.K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, S. Nakamura

Physics Letters B　789　45-53　2019/02
Publisher: Elsevier BV
DOI： 10.1016/j.physletb.2018.10.070 　

ISSN： 0370-2693
A measurement of the scintillation decay time constant of nuclear recoils in liquid xenon with the XMASS-I detector Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, H. Ogawa, K. Sato, H. Sekiya, T. Suzuki, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, Y. Suzuki, B. D. Xu, K. Miuchi, N. Oka, Y. Takeuchi, Y.H. Kim, K.B. Lee, M.K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, K. Fushimi, G. Kanzaki, S. Nakamura

Journal of Instrumentation　13　(12)　P12032-P12032　2018/12/20
Publisher: IOP Publishing
DOI： 10.1088/1748-0221/13/12/p12032 　

eISSN： 1748-0221
Search for dark matter in the form of hidden photons and axion-like particles in the XMASS detector Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, H. Ogawa, K. Sato, H. Sekiya, T. Suzuki, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, Y. Suzuki, B.D. Xu, K. Miuchi, N. Oka, Y. Takeuchi, Y.H. Kim, K.B. Lee, M.K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, K. Fushimi, G. Kanzaki, S. Nakamura

Physics Letters B　787　153-158　2018/12
Publisher: Elsevier BV
DOI： 10.1016/j.physletb.2018.10.050 　

ISSN： 0370-2693
Development of the measurement of radium using a germanium detector with molecular recognition resin Peer-reviewed

S Ito, K Ichimura, Y Takaku, K Abe, M Ikeda, Y Kishimoto

Progress of Theoretical and Experimental Physics　2018　(9)　2018/09/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/pty096 　

eISSN： 2050-3911
Direct dark matter search by annual modulation with 2.7 years of XMASS-I data Peer-reviewed

K.Abe, K.Hiraide, K.Ichimura, Y.Kishimoto, K.Kobayashi, M.Kobayashi, S.Moriyama, M.Nakahata, T.Norita, H.Ogawa, K.Sato, H.Sekiya, O.Takachio, A.Takeda, S.Tasaka, M.Yamashita, B.S.Yang, N.Y.Kim, Y.D.Kim, Y.Itow, K.Kanzawa, R.Kegasa, K.Masuda, H.Takiya, K.Fushimi, G.Kanzaki, K.Martens, Y.Suzuki, B.D.Xu, R.Fujita, K.Hosokawa, K.Miuchi, N.Oka, Y.Takeuchi, Y.H.Kim, K.B.Lee, M.K.Lee, Y.Fukuda, M.Miyasaka, K.Nishijima, S.Nakamura, MASS Collaboration

Physical Review D　97　(10)　102006　2018/05/21
Publisher: American Physical Society
DOI： 10.1103/PhysRevD.97.102006 　

ISSN： 0370-2693

eISSN： 2470-0029
Improved search for two-neutrino double electron capture on 124Xe and 126Xe using particle identification in XMASS-I Peer-reviewed

K Abe, K Hiraide, K Ichimura, Y Kishimoto, K Kobayashi, M Kobayashi, S Moriyama, M Nakahata, T Norita, H Ogawa, K Sato, H Sekiya, O Takachio, A Takeda, S Tasaka, M Yamashita, B S Yang, N Y Kim, Y D Kim, Y Itow, K Kanzawa, R Kegasa, K Masuda, H Takiya, K Fushimi, G Kanzaki, K Martens, Y Suzuki, B D Xu, R Fujita, K Hosokawa, K Miuchi, N Oka, Y Takeuchi, Y H Kim, K B Lee, M K Lee, Y Fukuda, M Miyasaka, K Nishijima, S Nakamura

Progress of Theoretical and Experimental Physics　2018　(5)　2018/05/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/ptep/pty053 　

eISSN： 2050-3911
Identification of 210Pb and 210Po in the bulk of copper samples with a low-background alpha particle counter Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, K. Sato, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. Itow, K. Kanzawa, R. Kegasa, K. Masuda, H. Takiya, K. Fushimi, G. Kanzaki, K. Martens, Y. Suzuki, B. D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, S. Nakamura

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　884　157-161　2018/03/11
Publisher: Elsevier B.V.
DOI： 10.1016/j.nima.2017.12.015 　

ISSN： 0168-9002
Search for solar Kaluza–Klein axions by annual modulation with the XMASS-I detector Peer-reviewed

N Oka, K Abe, K Hiraide, K Ichimura, Y Kishimoto, K Kobayashi, M Kobayashi, S Moriyama, M Nakahata, T Norita, H Ogawa, K Sato, H Sekiya, O Takachio, A Takeda, S Tasaka, M Yamashita, B S Yang, N Y Kim, Y D Kim, Y Itow, K Kanzawa, R Kegasa, K Masuda, H Takiya, K Fushimi, G Kanzaki, K Martens, Y Suzuki, B D Xu, R Fujita, K Hosokawa, K Miuchi, Y Takeuchi, Y H Kim, K B Lee, M K Lee, Y Fukuda, M Miyasaka, K Nishijima, S Nakamura

Progress of Theoretical and Experimental Physics　2017　(10)　2017/10/01

DOI： 10.1093/ptep/ptx137 　

ISSN： 2050-3911

eISSN： 2050-3911
Detectability of galactic supernova neutrinos coherently scattered on xenon nuclei in XMASS Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, S. Tasaka, J. Liu, K. Martens, Y. Suzuki, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Onishi, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, H. Takiya, H. Uchida, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

ASTROPARTICLE PHYSICS　89　51-56　2017/03

DOI： 10.1016/j.astropartphys.2017.01.006 　

ISSN： 0927-6505

eISSN： 1873-2852
Search for neutrino-less double beta decay of 48 Ca CANDLES Peer-reviewed

S. Umehara, T. Kishimoto, M. Nomachi, S. Ajimura, N. Nakatani, K. Mtasuoka, K. Ichimura, M. Saka, T. Ishikawa, D. Tanaka, M. Tanaka, S. Yoshida, K. Suzuki, G. Ito, H. Kakubata, W. Wang, J. Takemoto, W.M. Chan, M. Doihara, Y. Tamagawa, I. Ogawa, T. Ueno, S. Maeda, A. Yamamoto, S. Tomita, G. Fujita, A. Kawamura, T. Harada, Ken-Ichi Fushimi, Ryuta Hazama, H. Ohsumi, K. Okada

Proceedings of Physics(INPC2916) The 26th International Nuclear Physics Conference　2016-September　246-246　2016/10/11

eISSN： 1824-8039
A measurement of the time profile of scintillation induced by low energy gamma-rays in liquid xenon with the XMASS-I detector Peer-reviewed

H. Takiya, K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, K. Fushimi, K. Martens, Y. Suzuki, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Onishi, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, K. Nishijima, S. Nakamura

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　834　192-196　2016/10

DOI： 10.1016/j.nima.2016.08.014 　

ISSN： 0168-9002

eISSN： 1872-9576
Search for two-neutrino double electron capture on Xe-124 with the XMASS-I detector Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, S. Tasaka, J. Liu, K. Martens, Y. Suzuki, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Onishi, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, H. Takiya, H. Uchida, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

PHYSICS LETTERS B　759　64-68　2016/08

DOI： 10.1016/j.physletb.2016.05.039 　

ISSN： 0370-2693

eISSN： 1873-2445
Direct dark matter search by annual modulation in XMASS-I Peer-reviewed

K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, S. Tasaka, K. Fushimi, J. Liu, K. Martens, Y. Suzuki, B. D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, Y. Onishi, N. Oka, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, H. Takiya, K. Nishijima, S. Nakamura

PHYSICS LETTERS B　759　272-276　2016/08

DOI： 10.1016/j.physletb.2016.05.081 　

ISSN： 0370-2693

eISSN： 1873-2445
Be-7 solar neutrino measurement with KamLAND Peer-reviewed

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, Y. Kishimoto, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakajima, K. Nakamura, A. Obata, A. Oki, Y. Oki, M. Otani, I. Shimizu, J. Shirai, A. Suzuki, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, Y. Yamauchi, H. Yoshida, A. Kozlov, Y. Takemoto, S. Yoshida, C. Grant, G. Keefer, D. W. McKee, A. Piepke, T. I. Banks, T. Bloxham, S. J. Freedman, B. K. Fujikawa, K. Han, L. Hsu, K. Ichimura, H. Murayama, T. O'Donnell, H. M. Steiner, L. A. Winslow, D. Dwyer, C. Mauger, R. D. McKeown, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, J. G. Learned, M. Sakai, G. A. Horton-Smith, A. Tang, K. E. Downum, K. Tolich, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, K. Heeger, M. P. Decowski

PHYSICAL REVIEW C　92　(5)　2015/11

DOI： 10.1103/PhysRevC.92.055808 　

ISSN： 0556-2813

eISSN： 1089-490X
The CANDLES Trigger System for the Study of Double Beta Decay of Ca-48 Peer-reviewed

T. Maeda, S. Ajimura, W. M. Chan, K. Fushimi, R. Hazama, K. Ichimura, T. Iida, Y. Inukai, T. Ishikawa, H. Kakubata, T. Kishimoto, K. Matsuoka, K. Nakajima, N. Nakatani, M. Nomachi, I. Ogawa, T. Ohata, H. Ohsumi, M. Saka, K. Sakamoto, K. Seki, Y. Sugaya, K. Suzuki, Y. Tamagawa, D. Tanaka, K. Tetsuno, V. T. T. Trang, S. Umehara, W. Wang, S. Yoshida, M. Yoshizawa

IEEE TRANSACTIONS ON NUCLEAR SCIENCE　62　(3)　1128-1134　2015/06

DOI： 10.1109/TNS.2015.2423275 　

ISSN： 0018-9499

eISSN： 1558-1578
New DAQ System for the CANDLES Experiment Peer-reviewed

K. Suzuki, S. Ajimura, W. M. Chan, K. Fushimi, R. Hazama, K. Ichimura, T. Iida, Y. Inukai, H. Kakubata, T. Kishimoto, S. Maeda, T. Maeda, K. Matsuoka, K. Nakajima, N. Nakatani, M. Nomachi, I. Ogawa, T. Ohata, H. Ohsumi, K. Sakamoto, Y. Tamagawa, D. Tanaka, K. Tetsuno, V. T. T. Trang, S. Umehara, W. Wang, S. Yoshida, M. Yoshizawa

IEEE TRANSACTIONS ON NUCLEAR SCIENCE　62　(3)　1122-1127　2015/06

DOI： 10.1109/TNS.2015.2423673 　

ISSN： 0018-9499

eISSN： 1558-1578
Search for Neutrino-less Double Beta Decay with CANDLES Peer-reviewed

S. Umehara, T. Kishimoto, M. Nomachi, S. Ajimura, T. Iida, K. Nakajima, K. Ichimura, K. Matsuoka, T. Ishikawa, D. Tanaka, M. Tanaka, T. Maeda, S. Yoshida, K. Suzuki, H. Kakubata, W.Wang, V. T, T. Trang, W. M. Chan, M. Doihara, T. Ohata, K. Tetsuno, Y. Tamagawa, I. Ogawa, S. Tomita, G. Fujita, A. Kawamura, T. Harada, Y. Inukai, K. Sakamoto, M. Yoshizawa, K. Fushimi, R. Hazama, N. Nakatani, H. Ohsumi, K. Okada

Proceedings of 20th International Conference on Particles and Nuclei (PANIC 14)　2016-September　329-333　2015/06

DOI： 10.3204/DESY-PROC-2014-04/97 　

eISSN： 1824-8039
Search for Neutrino-less Double Beta Decay with CANDLES Peer-reviewed

S. Umehara, T. Kishimoto, M. Nomachi, S. Ajimura, T. Iida, K. Nakajima, K. Ichimura, K. Matsuoka, M. Saka, T. Ishikawa, D. Tanaka, M. Tanaka, T. Maeda, S. Yoshida, K. Suzuki, G. Ito, H. Kakubata, W. Wang, V. T.T. Trang, W. M. Chan, J. Takemoto, M. Doihara, T. Ohata, K. Tetsuno, Y. Tamagawa, I. Ogawa, T. Ueno, S. Maeda, A. Yamamoto, S. Tomita, G. Fujita, A. Kawamura, T. Harada, Y. Inukai, K. Sakamoto, M. Yoshizawa, K. Fushimi, R. Hazama, N. Nakatani, H. Ohsumi, K. Okada

Physics Procedia　61　283-288　2015
Publisher: Elsevier B.V.
DOI： 10.1016/j.phpro.2014.12.046 　

ISSN： 1875-3892 1875-3884

eISSN： 1875-3892
Laboratory studies on the removal of radon-born lead from KamLAND's organic liquid scintillator Peer-reviewed

Keefer, G., Grant, C., Piepke, A., Ebihara, T., Ikeda, H., Kishimoto, Y., Kibe, Y., Koseki, Y., Ogawa, M., Shirai, J., Takeuchi, S., Mauger, C., Zhang, C., Schweitzer, G., Berger, B.E., Dazeley, S., Decowski, M.P., Detwiler, J.A., Djurcic, Z., Dwyer, D.A., Efremenko, Y., Enomoto, S., Freedman, S.J., Fujikawa, B.K., Furuno, K., G, o, A., G, o, Y., Gratta, G., Hatakeyama, S., Heeger, K.M., Hsu, L., Ichimura, K., Inoue, K., Iwamoto, T., Kamyshkov, Y., Karwowski, H.J., Koga, M., Kozlov, A., Lane, C.E., Learned, J.G., Maricic, J., Markoff, D.M., Matsuno, S., McKee, D., McKeown, R.D., Miletic, T., Mitsui, T., Motoki, M., Nakajima, K., Nakajima, K., Nakamura, K., O{'}Donnell, T., Ogawa, H., Piquemal, F., Ricol, J.-S., Shimizu, I., Suekane, F., Suzuki, A., Svoboda, R., Tajima, O., Takemoto, Y., Tamae, K., Tolich, K., Tornow, W., Watanabe, H., Watanabe, H., Winslow, L.A., Yoshida, S.

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment　769　79-87　2015/01

DOI： 10.1016/j.nima.2014.09.050 　

ISSN： 0168-9002

eISSN： 1872-9576
A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector Peer-reviewed

T. I. Banks, S. J. Freedman, J. Wallig, N. Ybarrolaza, A. Gando, Y. Gando, H. Ikeda, K. Inoue, Y. Kishimoto, M. Koga, T. Mitsui, K. Nakamura, I. Shimizu, J. Shirai, A. Suzuki, Y. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, H. Yoshida, S. Yoshida, A. Kozlov, C. Grant, G. Keefer, A. Piepke, T. Bloxham, B. K. Fujikawa, K. Han, K. Ichimura, H. Murayama, T. O'Donnell, H. M. Steiner, L. A. Winslow, D. A. Dwyer, R. D. McKeown, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, M. Sakai, G. A. Horton-Smith, K. E. Downum, G. Gratta, Y. Efremenko, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, J. A. Detwiler, S. Enomoto, M. P. Decowski

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　769　88-96　2015/01

DOI： 10.1016/j.nima.2014.09.068 　

ISSN： 0168-9002

eISSN： 1872-9576
Search for Bosonic Superweakly Interacting Massive Dark Matter Particles with the XMASS-I Detector Peer-reviewed

K. Abe, K. Hieda, K. Hiraide, S. Hirano, Y. Kishimoto, K. Ichimura, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, K. Masuda, H. Takiya, H. Uchida, N. Y. Kim, Y. D. Kim, F. Kusaba, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

PHYSICAL REVIEW LETTERS　113　(12)　2014/09

DOI： 10.1103/PhysRevLett.113.121301 　

ISSN： 0031-9007

eISSN： 1079-7114
Search for inelastic WIMP nucleus scattering on Xe-129 in data from the XMASS-I experiment Peer-reviewed

H. Uchida, K. Abe, K. Hieda, K. Hiraide, S. Hirano, K. Ichimura, Y. Kishimoto, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, K. Masuda, Y. Nishitani, H. Takiya, N. Y. Kim, Y. D. Kim, F. Kusaba, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS　2014　(6)　2014/06

DOI： 10.1093/ptep/ptu064 　

ISSN： 2050-3911
CANDLES: Search for neutrino-less double beta decay of 48Ca Peer-reviewed

S. Umehara, T. Kishimoto, M. Nomachi, S. Ajimura, N. Nakatani, K. Matsuoka, K. Ichimura, M. Saka, T. Ishikawa, D. Tanaka, M. Tanaka, S. Yoshida, K. Suzuki, G. Ito, H. Kakubata, W. Wang, J. Takemoto, W. M. Chan, M. Doihara, Y. Tamagawa, I. Ogawa, T. Ueno, S. Maeda, A. Yamamoto, S. Tomita, G. Fujita, A. Kawamura, T. Harada, K. Fushimi, R. Hazama, H. Ohsumi, K. Okada

EPJ Web of Conferences　66　2014

DOI： 10.1051/epjconf/20146608008 　

ISSN： 2101-6275 2100-014X
Search for neutrino-less double beta decay by CANDLES

S. Umehara, T. Kishimoto, M. Nomachi, S. Yoshida, S. Ajimura, K. Suzuki, K. Ichimura, K. Matsuoka, N. Nakatani, G. Ito, H. Kakubata, M. Saka, W. Wang, J. Takemoto, W. Chan, M. Doihara, Y. Tamagawa, I. Ogawa, S. Ueno, S. Maeda, A. Yamamoto, S. Tomita, G. Fujita, A. Kawamura, T. Harada, K. Fushimi, R. Hazama, H. Ohsumi, K. Okada

AIP Conference Proceedings　1533　115-120　2013

DOI： 10.1063/1.4806786 　

ISSN： 0094-243X 1551-7616

eISSN： 1551-7616
CUORE crystal validation runs: Results on radioactive contamination and extrapolation to CUORE background Peer-reviewed

F. Alessandria, E. Andreotti, R. Ardito, C. Arnaboldi, F. T. Avignone, M. Balata, I. Bandac, T. I. Banks, G. Bari, J. Beeman, F. Bellini, A. Bersani, M. Biassoni, T. Bloxham, C. Brofferio, A. Bryant, C. Bucci, X. Z. Cai, L. Canonica, S. Capelli, L. Carbone, L. Cardani, M. Carrettoni, N. Chott, M. Clemenza, C. Cosmelli, O. Cremonesi, R. J. Creswick, I. Dafinei, A. Dally, A. De Biasi, M. P. Decowski, M. M. Deninno, A. de Waard, S. Di Domizio, L. Ejzak, R. Faccini, D. Q. Fang, H. A. Farach, E. Ferri, F. Ferroni, E. Fiorini, L. Foggetta, S. J. Freedman, G. Frossati, A. Giachero, L. Gironi, A. Giuliani, P. Gorla, C. Gotti, E. Guardincerri, T. D. Gutierrez, E. E. Haller, K. Han, K. M. Heeger, H. Z. Huang, K. Ichimura, R. Kadel, K. Kazkaz, G. Keppel, L. Kogler, Yu. G. Kolomensky, S. Kraft, D. Lenz, Y. L. Li, X. Liu, E. Longo, Y. G. Ma, C. Maiano, G. Maier, C. Martinez, M. Martinez, R. H. Maruyama, N. Moggi, S. Morganti, S. Newman, S. Nisi, C. Nones, E. B. Norman, A. Nucciotti, F. Orio, D. Orlandi, J. L. Ouellet, M. Pallavicini, V. Palmieri, L. Pattavina, M. Pavan, M. Pedretti, G. Pessina, S. Pirro, E. Previtali, V. Rampazzo, F. Rimondi, C. Rosenfeld, C. Rusconi, C. Salvioni, S. Sangiorgio, D. Schaeffer, N. D. Scielzo, M. Sisti, A. R. Smith, F. Stivanello, L. Taffarello, G. Terenziani, W. D. Tian, C. Tomei, S. Trentalange, G. Ventura, M. Vignati, B. S. Wang, H. W. Wang, C. A. Whitten, T. Wise, A. Woodcraft, N. Xu, L. Zanotti, C. Zarra, B. X. Zhu, S. Zucchelli

ASTROPARTICLE PHYSICS　35　(12)　839-849　2012/07

DOI： 10.1016/j.astropartphys.2012.02.008 　

ISSN： 0927-6505

eISSN： 1873-2852
SEARCH FOR EXTRATERRESTRIAL ANTINEUTRINO SOURCES WITH THE KamLAND DETECTOR Peer-reviewed

A. Gando, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Minekawa, T. Mitsui, T. Morikawa, N. Nagai, K. Nakajima, K. Nakamura, K. Narita, I. Shimizu, Y. Shimizu, J. Shirai, F. Suekane, A. Suzuki, H. Takahashi, N. Takahashi, Y. Takemoto, K. Tamae, H. Watanabe, B. D. Xu, H. Yabumoto, H. Yoshida, S. Yoshida, S. Enomoto, A. Kozlov, H. Murayama, C. Grant, G. Keefer, A. Piepke, T. I. Banks, T. Bloxham, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, R. Kadel, T. O'Donnell, H. M. Steiner, D. A. Dwyer, R. D. McKeown, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, M. Sakai, G. A. Horton-Smith, K. E. Downum, G. Gratta, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, M. P. Decowski

ASTROPHYSICAL JOURNAL　745　(2)　2012/02

DOI： 10.1088/0004-637X/745/2/193 　

ISSN： 0004-637X
Search for Neutrino-less Double Beta Decay with CANDLES Peer-reviewed

S. Umehara, T. Kishimoto, M. Nomachi, S. Yoshida, K. Matsuoka, K. Ichimura, G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, M. Saka, K. Seki, K. Takubo, W. Wang, S. Ajimura, N. Nakatani, Y. Tamagawa, I. Ogawa, K. Fushimi, R. Hazama, H. Ohsumi, K. Okada, Y. Fujii, M. Nomura, T. Kaneshiki, Y. Sakuma, T. Suzuki, S. Nemoto

19TH PARTICLES AND NUCLEI INTERNATIONAL CONFERENCE (PANIC11)　1441　448-450　2012

DOI： 10.1063/1.3700581 　

ISSN： 0094-243X
Measurement of the B-8 solar neutrino flux with the KamLAND liquid scintillator detector Peer-reviewed

S. Abe, K. Furuno, A. Gando, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, W. Kimura, Y. Kishimoto, M. Koga, Y. Minekawa, T. Mitsui, T. Morikawa, N. Nagai, K. Nakajima, K. Nakamura, M. Nakamura, K. Narita, I. Shimizu, Y. Shimizu, J. Shirai, F. Suekane, A. Suzuki, H. Takahashi, N. Takahashi, Y. Takemoto, K. Tamae, H. Watanabe, B. D. Xu, H. Yabumoto, E. Yonezawa, H. Yoshida, S. Yoshida, S. Enomoto, A. Kozlov, H. Murayama, C. Grant, G. Keefer, D. McKee, A. Piepke, T. I. Banks, T. Bloxham, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, R. Kadel, T. O'Donnell, H. M. Steiner, L. A. Winslow, D. A. Dwyer, C. Mauger, R. D. McKeown, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, S. Pakvasa, M. Sakai, G. A. Horton-Smith, A. Tang, K. E. Downum, G. Gratta, K. Tolich, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, F. Piquemal, J-S. Ricol, M. P. Decowski

PHYSICAL REVIEW C　84　(3)　2011/09

DOI： 10.1103/PhysRevC.84.035804 　

ISSN： 0556-2813
Partial radiogenic heat model for Earth revealed by geoneutrino measurements Peer-reviewed

A. Gando, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Minekawa, T. Mitsui, T. Morikawa, N. Nagai, K. Nakajima, K. Nakamura, K. Narita, I. Shimizu, Y. Shimizu, J. Shirai, F. Suekane, A. Suzuki, H. Takahashi, N. Takahashi, Y. Takemoto, K. Tamae, H. Watanabe, B. D. Xu, H. Yabumoto, H. Yoshida, S. Yoshida, S. Enomoto, A. Kozlov, H. Murayama, C. Grant, G. Keefer, A. Piepke, T. I. Banks, T. Bloxham, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, R. Kadel, T. O'Donnell, H. M. Steiner, D. A. Dwyer, R. D. McKeown, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, M. Sakai, G. A. Horton-Smith, K. E. Downum, G. Gratta, K. Tolich, Y. Efremenko, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, M. P. Decowski

NATURE GEOSCIENCE　4　(9)　647-651　2011/09

DOI： 10.1038/ngeo1205 　

ISSN： 1752-0894
Constraints on theta(13) from a three-flavor oscillation analysis of reactor antineutrinos at KamLAND Peer-reviewed

A. Gando, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Minekawa, T. Mitsui, T. Morikawa, N. Nagai, K. Nakajima, K. Nakamura, K. Narita, I. Shimizu, Y. Shimizu, J. Shirai, F. Suekane, A. Suzuki, H. Takahashi, N. Takahashi, Y. Takemoto, K. Tamae, H. Watanabe, B. D. Xu, H. Yabumoto, H. Yoshida, S. Yoshida, S. Enomoto, A. Kozlov, H. Murayama, C. Grant, G. Keefer, A. Piepke, T. I. Banks, T. Bloxham, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, R. Kadel, T. O'Donnell, H. M. Steiner, D. A. Dwyer, R. D. McKeown, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, M. Sakai, G. A. Horton-Smith, K. E. Downum, G. Gratta, Y. Efremenko, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, M. P. Decowski

PHYSICAL REVIEW D　83　(5)　2011/03

DOI： 10.1103/PhysRevD.83.052002 　

ISSN： 1550-7998
Production of radioactive isotopes through cosmic muon spallation in KamLAND Peer-reviewed

S. Abe, S. Enomoto, K. Furuno, Y. Gando, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Minekawa, T. Mitsui, K. Nakajima, K. Nakajima, K. Nakamura, M. Nakamura, I. Shimizu, Y. Shimizu, J. Shirai, F. Suekane, A. Suzuki, Y. Takemoto, K. Tamae, A. Terashima, H. Watanabe, E. Yonezawa, S. Yoshida, A. Kozlov, H. Murayama, J. Busenitz, T. Classen, C. Grant, G. Keefer, D. S. Leonard, D. McKee, A. Piepke, T. I. Banks, T. Bloxham, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, F. Gray, E. Guardincerri, L. Hsu, K. Ichimura, R. Kadel, C. Lendvai, K. B. Luk, T. O'Donnell, H. M. Steiner, L. A. Winslow, D. A. Dwyer, C. Jillings, C. Mauger, R. D. McKeown, P. Vogel, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, S. Pakvasa, J. Foster, G. A. Horton-Smith, A. Tang, S. Dazeley, K. E. Downum, G. Gratta, K. Tolich, W. Bugg, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, F. Piquemal, J. S. Ricol, M. P. Decowski

Physical Review C - Nuclear Physics　81　(2)　2010/02/23
Publisher: American Physical Society
DOI： 10.1103/PhysRevC.81.025807 　

ISSN： 1089-490X 0556-2813
The KamLAND full-volume calibration system Peer-reviewed

B. E. Berger, J. Busenitz, T. Classen, M. P. Decowski, D. A. Dwyer, G. Elor, A. Frank, S. J. Freedman, B. K. Fujikawa, M. Galloway, F. Gray, K. M. Heeger, L. Hsu, K. Ichimura, R. Kadel, G. Keefer, C. Lendvai, D. McKee, T. O'Donnell, A. Piepke, H. M. Steiner, D. Syversrud, J. Wallig, L. A. Winslow, T. Ebihara, S. Enomoto, K. Furuno, Y. Gando, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Minekawa, T. Mitsui, K. Nakajima, K. Nakajima, K. Nakamura, K. Owada, I. Shimizu, Y. Shimizu, J. Shirai, F. Suekane, A. Suzuki, K. Tamae, S. Yoshida, A. Kozlov, H. Murayama, C. Grant, D. S. Leonard, K-B. Luk, C. Jillings, C. Mauger, R. D. McKeown, C. Zhang, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, S. Pakvasa, J. Foster, G. A. Horton-Smith, A. Tang, S. Dazeley, K. E. Downum, G. Gratta, K. Tolich, W. Bugg, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, F. Piquemal, J-S. Ricol

JOURNAL OF INSTRUMENTATION　4　2009/04

DOI： 10.1088/1748-0221/4/04/P04017 　

ISSN： 1748-0221
Erratum: Precision measurement of neutrino oscillation parameters with KamLAND (Physical Review Letters (2008) 100 (221803))

Abe, S., Ebihara, T., Enomoto, S., Furuno, K., G, o, Y., Ichimura, K., Ikeda, H., Inoue, K., Kibe, Y., Kishimoto, Y., Koga, M., Shimizu, Y., Kozlov, A., Minekawa, Y., Mitsui, T., Nakajima, K., Nakajima, K., Nakamura, K., Nakamura, M., Owada, K., Shimizu, I., Shirai, J., Suekane, F., Suzuki, A., Takemoto, Y., Tamae, K., Terashima, A., Watanabe, H., Yonezawa, E., Yoshida, S., Busenitz, J., Classen, T., Grant, C., Keefer, G., Leonard, D.S., McKee, D., Piepke, A., Decowski, M.P., Detwiler, J.A., Freedman, S.J., Fujikawa, B.K., Gray, F., Guardincerri, E., Hsu, L., Kadel, R., Lendvai, C., Luk, K.-B., Murayama, H., O{'}Donnell, T., Steiner, H.M., Winslow, L.A., Dwyer, D.A., Jillings, C., Mauger, C., McKeown, R.D., Vogel, P., Zhang, C., Berger, B.E., Lane, C.E., Maricic, J., Miletic, T., Batygov, M., Learned, J.G., Matsuno, S., Pakvasa, S., Foster, J., Horton-Smith, G.A., Tang, A., Dazeley, S., Downum, K.E., Gratta, G., Tolich, K., Bugg, W., Efremenko, Y., Kamyshkov, Y., Perevozchikov, O., Karwowski, H.J., Markoff, D.M., Tornow, W., Heeger, K.M., Piquemal, F., Ricol, J.-S.

Physical Review Letters　101　(11)　2008/09/12

DOI： 10.1103/PhysRevLett.101.119904 　

ISSN： 0031-9007 1079-7114
Precision measurement of neutrino oscillation parameters with KamLAND Peer-reviewed

S. Abe, T. Ebihara, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, A. Kozlov, Y. Minekawa, T. Mitsui, K. Nakajima, K. Nakajima, K. Nakamura, M. Nakamura, K. Owada, I. Shimizu, Y. Shimizu, J. Shirai, F. Suekane, A. Suzuki, Y. Takemoto, K. Tamae, A. Terashima, H. Watanabe, E. Yonezawa, S. Yoshida, J. Busenitz, T. Classen, C. Grant, G. Keefer, D. S. Leonard, D. McKee, A. Piepke, M. P. Decowski, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, F. Gray, E. Guardincerri, L. Hsu, R. Kadel, C. Lendvai, K. -B. Luk, H. Murayama, T. O'Donnell, H. M. Steiner, L. A. Winslow, D. A. Dwyer, C. Jillings, C. Mauger, R. D. McKeown, P. Vogel, C. Zhang, B. E. Berger, C. E. Lane, J. Maricic, T. Miletic, M. Batygov, J. G. Learned, S. Matsuno, S. Pakvasa, J. Foster, G. A. Horton-Smith, A. Tang, S. Dazeley, K. E. Downum, G. Gratta, K. Tolich, W. Bugg, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, D. M. Markoff, W. Tornow, K. M. Heeger, F. Piquemal, J. -S. Ricol

PHYSICAL REVIEW LETTERS　100　(22)　2008/06

DOI： 10.1103/PhysRevLett.100.221803 　

ISSN： 0031-9007
Publisher's note: Precision measurement of neutrino oscillation parameters with KamLAND Peer-reviewed

Abe, S., Ebihara, T., Enomoto, S., Furuno, K., G, o, Y., Ichimura, K., Ikeda, H., Inoue, K., Kibe, Y., Kishimoto, Y., Koga, M., Shimizu, Y., Kozlov, A., Minekawa, Y., Mitsui, T., Nakajima, K., Nakajima, K., Nakamura, K., Nakamura, M., Owada, K., Shimizu, I., Shirai, J., Suekane, F., Suzuki, A., Takemoto, Y., Tamae, K., Terashima, A., Watanabe, H., Yonezawa, E., Yoshida, S., Busenitz, J., Classen, T., Grant, C., Keefer, G., Leonard, D.S., McKee, D., Piepke, A., Decowski, M.P., Detwiler, J.A., Freedman, S.J., Fujikawa, B.K., Gray, F., Guardincerri, E., Hsu, L., Kadel, R., Lendvai, C., Luk, K.-B., Murayama, H., O{'}Donnell, T., Steiner, H.M., Winslow, L.A., Dwyer, D.A., Jillings, C., Mauger, C., McKeown, R.D., Vogel, P., Zhang, C., Berger, B.E., Lane, C.E., Maricic, J., Miletic, T., Batygov, M., Learned, J.G., Matsuno, S., Pakvasa, S., Foster, J., Horton-Smith, G.A., Tang, A., Dazeley, S., Downum, K.E., Gratta, G., Tolich, K., Bugg, W., Efremenko, Y., Kamyshkov, Y., Perevozchikov, O., Karwowski, H.J., Markoff, D.M., Tornow, W., Heeger, K.M., Piquemal, F., Ricol, J.-S.

Physical Review Letters　101　(25)　2008

DOI： 10.1103/PhysRevLett.101.259901 　

ISSN： 0031-9007 1079-7114
Search for the invisible decay of neutrons with KamLAND Peer-reviewed

T Araki, S Enomoto, K Furuno, Y Gando, K Ichimura, H Ikeda, K Inoue, Y Kishimoto, M Koga, Y Koseki, T Maeda, T Mitsui, M Motoki, K Nakajima, K Nakamura, H Ogawa, M Ogawa, K Owada, JS Ricol, Shimizu, I, J Shirai, F Suekane, A Suzuki, K Tada, S Takeuchi, K Tamae, Y Tsuda, H Watanabe, J Busenitz, T Classen, Z Djurcic, G Keefer, DS Leonard, A Piepke, E Yakushev, BE Berger, YD Chan, MP Decowski, DA Dwyer, SJ Freedman, BK Fujikawa, J Goldman, F Gray, KM Heeger, L Hsu, KT Lesko, KB Luk, H Murayama, T O'Donnell, AWP Poon, HM Steiner, LA Winslow, C Jillings, C Mauger, RD McKeown, P Vogel, C Zhang, CE Lane, T Miletic, G Guillian, JG Learned, J Maricic, S Matsuno, S Pakvasa, GA Horton-Smith, S Dazeley, S Hatakeyama, A Rojas, R Svoboda, BD Dieterle, J Detwiler, G Gratta, K Ishii, N Tolich, Y Uchida, M Batygov, W Bugg, Y Efremenko, Y Kamyshkov, A Kozlov, Y Nakamura, HJ Karwowski, DM Markoff, RM Rohm, W Tornow, R Wendell, MJ Chen, YF Wang, F Piquemal

PHYSICAL REVIEW LETTERS　96　(10)　2006/03

DOI： 10.1103/PhysRevLett.96.101802 　

ISSN： 0031-9007

eISSN： 1079-7114
Experimental investigation of geologically produced antineutrinos with KamLAND Peer-reviewed

T Araki, S Enomoto, K Furuno, Y Gando, K Ichimura, H Ikeda, K Inoue, Y Kishimoto, M Koga, Y Koseki, T Maeda, T Mitsui, M Motoki, K Nakajima, H Ogawa, M Ogawa, K Owada, JS Ricol, Shimizu, I, J Shirai, F Suekane, A Suzuki, K Tada, S Takeuchi, K Tamae, Y Tsuda, H Watanabe, J Busenitz, T Classen, Z Djurcic, G Keefer, D Leonard, A Piepke, E Yakushev, BE Berger, YD Chan, MP Decowski, DA Dwyer, SJ Freedman, BK Fujikawa, J Goldman, F Gray, KM Heeger, L Hsu, KT Lesko, KB Luk, H Murayama, T O'Donnell, AWP Poon, HM Steiner, LA Winslow, C Mauger, RD McKeown, P Vogel, CE Lane, T Miletic, G Guillian, JG Learned, J Maricic, S Matsuno, S Pakvasa, GA Horton-Smith, S Dazeley, S Hatakeyama, A Rojas, R Svoboda, BD Dieterle, J Detwiler, G Gratta, K Ishii, N Tolich, Y Uchida, M Batygov, W Bugg, Y Efremenko, Y Kamyshkov, A Kozlov, Y Nakamura, HJ Karwowski, DM Markoff, K Nakamura, RM Rohm, W Tornow, R Wendell, MJ Chen, YF Wang, F Piquemal

NATURE　436　(7050)　499-503　2005/07

DOI： 10.1038/nature03980 　

ISSN： 0028-0836
Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion Peer-reviewed

T Araki, K Eguchi, S Enomoto, K Furuno, K Ichimura, H Ikeda, K Inoue, K Ishihara, T Iwamoto, T Kawashima, Y Kishimoto, M Koga, Y Koseki, T Maeda, T Mitsui, M Motoki, K Nakajima, H Ogawa, K Owada, JS Ricol, Shimizu, I, J Shirai, F Suekane, A Suzuki, K Tada, O Tajima, K Tamae, Y Tsuda, H Watanabe, J Busenitz, T Classen, Z Djurcic, G Keefer, K McKinny, DM Mei, A Piepke, E Yakushev, BE Berger, YD Chan, MP Decowski, DA Dwyer, SJ Freedman, Y Fu, BK Fujikawa, J Goldman, F Gray, KM Heeger, KT Lesko, KB Luk, H Murayama, AWP Poon, HM Steiner, LA Winslow, GA Horton-Smith, C Mauger, RD McKeown, P Vogel, CE Lane, T Miletic, PW Gorham, G Guillian, JG Learned, J Maricic, S Matsuno, S Pakvasa, S Dazeley, S Hatakeyama, A Rojas, R Svoboda, BD Dieterle, J Detwiler, G Gratta, K Ishii, N Tolich, Y Uchida, M Batygov, W Bugg, Y Efremenko, Y Kamyshkov, A Kozlov, Y Nakamura, CR Gould, HJ Karwowski, DM Markoff, JA Messimore, K Nakamura, RM Rohm, W Tornow, R Wendell, AR Young, MJ Chen, YF Wang, F Piquemal

PHYSICAL REVIEW LETTERS　94　(8)　2005/03

DOI： 10.1103/PhysRevLett.94.081801 　

ISSN： 0031-9007

Show all ︎Show first 5

Misc. 13

(Proceedings) Latest results from the XMASS experiment Peer-reviewed

Koichi Ichimura

PROCEEDINGS OF THE 14TH ASIA-PACIFIC PHYSICS CONFERENCE　2021
Publisher: AIP Publishing
DOI： 10.1063/5.0037305 　
Solar axion search by annual modulation with XMASS-I detector Peer-reviewed

Koichi Ichimura

Journal of Physics: Conference Series　1342　012068-012068　2020/01
Publisher: IOP Publishing
DOI： 10.1088/1742-6596/1342/1/012068 　

ISSN： 1742-6588

eISSN： 1742-6596
XMASS 1.5, the next step of the XMASS experiment

K. Ichimura for the, XMASS collaboration

PoS ICRC2015 (2016) 1223　236　2016/08

DOI： 10.22323/1.236.1223 　
The CANDLES experiment for the study of Ca-48 double beta decay

T. Iida, T. Kishimoto, M. Nomachi, S. Ajimura, S. Umehara, K. Nakajima, K. Ichimura, S. Yoshida, K. Suzuki, H. Kakubata, W. Wang, W. M. Chan, V. T. T. Trang, M. Doihara, T. Ishikawa, D. Tanaka, M. Tanaka, T. Maeda, T. Ohata, K. Tetsuno, Y. Tamagawa, I. Ogawa, S. Tomita, G. Fujita, A. Kawamura, T. Harada, Y. Inukai, K. Sakamoto, M. Yoshizawa, K. Fushimi, R. Hazama, N. Nakatani, H. Osumi, K. Okada

NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS　273　2633-2635　2016/04

DOI： 10.1016/j.nuclphysbps.2015.10.013 　

ISSN： 2405-6014

eISSN： 1873-3832
XMASS detector calibration using a neutron source Peer-reviewed

K. Ichimura

JOURNAL OF INSTRUMENTATION　11　2016/02

DOI： 10.1088/1748-0221/11/02/C02034 　

ISSN： 1748-0221
The XMASS experiment

K. Ichimura for the, XMASS collaboration

2014

DOI： 10.3204/DESY-PROC-2014-03/ichimura_koichi 　
CANDLES Project for the Neutrinoless Double Beta Decay of Peer-reviewed

K. Ichimura for, the CANDLES collaboration

JPS Conf.Proc. 1 (2014) 013022　2013/07

DOI： 10.7566/JPSCP.1.013022 　
29aHB-5 Energy and Position Calibration on CANDLES

Tanaka D., Kishimoto T., Nomachi M., Sugaya Y., Umehara S., Ichimura K., Saka M., Ishikawa T., Tanaka M., Yoshida S., Matsuoka M., Suzuki K., Ito G., Wang Wei, Kakubata S., Takemoto J., Chan Wei Min, Doihara S., Tamagawa Y., Ogawa I., CANDLES Collaboration

Meeting abstracts of the Physical Society of Japan　68　(1)　110-110　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aHB-2 Research for Double Beta Decay with CANDLES : Modified the Trigger System

Ishikawa T., Ichimura K., Umehara S., Kishimoto T., Saka M., Sugaya Y., Suzuki K., Tanaka D., Tanaka M., Nomachi M., Maeda T., Yoshida S., CANDLES Col.

Meeting abstracts of the Physical Society of Japan　68　(1)　109-109　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aSB-1 Study of double beta decay with CANDLES (102) : Status of the CANDLES experiment

Yoshida Sei, Temuge Batpurev, Bui Tuan Khai, CANDLES collaboration, Van Thi Thu Trang, Chan Wei Min

Meeting Abstracts of the Physical Society of Japan　70　(0)　202-202　2013/03
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.70.2.0_202 　

ISSN： 2189-079X
Neutrino-less Double Beta Decay of Ca-48 -CANDLES-

T. Kishimoto, S. Yoshida, K. Matsuoka, K. Ichimura, G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, K. Takubo, M. Nomachi, M. Saka, K. Seki, S. Ajimura, S. Umehara, N. Nakatani, Y. Tamagawa, I. Ogawa, K. Fushimi, R. Hazama, H. Ohsum, K. Okada, Y. Fujii

INTERNATIONAL CONFERENCE ON THE STRUCTURE OF BARYONS (BARYONS '10)　1388　(1)　142-148　2011

DOI： 10.1063/1.3647363 　

ISSN： 0094-243X
Recent Results from KamLAND

K.Ichimura for, the, KamLAND Collaboration

Proceeding at ICHEP 2008　2008
Background Study for KamLAND Reactor Neutrino Experiment Peer-reviewed

K. Ichimura, Y. Minekawa

TAUP2007: TENTH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS　120　2008

DOI： 10.1088/1742-6596/120/5/052034 　

ISSN： 1742-6588

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Presentations 41

Status and future prospect of the Kamioka ultra-low BG facility International-presentation Invited

Koichi Ichimura

Low Radioactivity Techniques (LRT2024)　2024/10/01
ガンマTESを用いたスズ112の2重電子捕獲反応探索手法の研究(2)

市村晃一, 石徹白晃治, 丸藤亜寿紗, 菊地貴大, 服部香里, スミスライアン, 山田真也, 岸本忠史

日本物理学会第79回年次大会　2024/09/19
ガンマTESを用いたスズ112の2重電子捕獲反応探索手法の研究

市村晃一, 石徹白晃治, 丸藤亜寿紗, 菊地貴大, 服部香里, 山森弘毅, 山田真也, 岸本忠史

日本物理学会 2024年春季大会　2024/03/19
Development of a method to measure trace level of uranium and thorium in scintillation films International-presentation

Kentaro Chiba, Koichi Ichimura, Yasuhiro Kishimoto, Aya Sakaguchi, Yuichi Takaku

UGAP2024 workshop, Sendai, Japan　2024/03/05
Application of gamma Transition-Edge-Sensor (TES) to 112Sn two-neutrino double electron capture search International-presentation

Koichi Ichimura, Koji Ishidoshiro, Azusa Gando, Kaori Hattori, Takahiro Kikuchi, Hirotake Yamamori, Shinya Yamada, Tadafumi Kishimoto

UGAP2024 workshop, Sendai, Japan　2024/03/05
極低放射能ゲルマニウム検出器の構築と運用 Invited

市村晃一

「第9回極低放射能技術」研究会　2024/02/06
Super-clean facility International-presentation Invited

K. Ichimura

NEXT-Zen Spain-Japan Workshop, Canfranc, Spain　2023/09/06
Application of gamma Transition-Edge-Sensor (TES) to 112Sn two-neutrino double electron capture search International-presentation

K. Ichimura, K.Ishidoshiro, A. Gando, K. Hattori, T. Kikuchi, H. Yamamori, S. Yamada, T. Kishimoto

XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023), Vienna, Austria　2023/08/28
二重ベータ崩壊実験の現状と将来実験について Invited

市村晃一

原子核によるバリオン数・レプトン数の物理　2023/03/09
Material screening with HPGe detector at Kamioka Invited

Koichi Ichimura

2022/11/25
Recent results from KamLAND-Zen Invited

Koichi Ichimura

NOW (Neutrino Oscillation Workshop) 2022　2022/09/09
New dark matter experiment with superconducting sensors at Kamioka

Koji Ishidoshiro, Koichi Ichimura

Unraveling the History of the Universe and Matter Evolution with Underground Physics　2022/06/14
HPGe検出器 Invited

市村晃一

「第六回極低放射能技術」研究会　2020/06/04
Latest results from the XMASS experiment

Koichi Ichimura

14th Asia-Pacific Physics Conference (APPC14)　2019/11/19
Measurement of the anisotropic response of the ZnWO4 crystal for developing the direction sensitive dark matter detector International-presentation

KOICHI ICHIMURA, J. Pedersen, H.Sekiya, A.Yamaji, S.Kurosawa

2019/09/29
XMASS実験：光電子増倍管R13111の放射性不純物量測定結果

市村晃一

日本物理学会 2019年秋季大会　2019/09/17
A measurement of the scintillation decay time constant in liquid xenon with the XMASS-I detector International-presentation

KOICHI ICHIMURA for, the, XMASS collaboration

16th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2019　2019/09/09
極低放射能ゲルマニウム検出器の開発 Invited

市村晃一

シンポジウム「地下から解き明かす宇宙の歴史と物質の進化」　2019/08/24
XMASS実験：ニュートリノの出ない4重ベータ崩壊の探索

市村晃一, for the, XMASS collaboration

日本物理学会第74回年次大会　2019/03/16
Recent results from the XMASS experiment International-presentation

KOICHI ICHIMURA

The 4th International Conference on Science, Application and Technology of Xenon Radiation Detector　2018/09/18
XMASS実験：中性子線源を用いた液体キセノンの原子核散乱の発光時定数測定

市村晃一, for the, XMASS collaboration

日本物理学会第73回年次大会　2018/03/23
XMASSの報告 Invited

市村晃一, for the, XMASS collaboration

第4回極低放射能技術研究会　2018/03/07
XMASS実験：太陽起源カルツァ＝クラインアクシオンの探索結果

市村晃一, for the, XMASS collaboration

日本物理学会 2017年秋季大会　2017/09/15
Solar axion search by annual modulation with XMASS-I detector International-presentation

KOICHI ICHIMURA

15th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2017　2017/07/24
XMASS実験：低エネルギー中性子線源の開発研究

市村晃一, for the, XMASS collaboration

日本物理学会第72回年次大会　2017/03/20
XMASS実験：中性子による原子核散乱を用いたXMASS検出器の較正

市村晃一, for the, XMASS collaboration

日本物理学会 2016年秋季大会　2016/09/22
Recent results from XMASS International-presentation Invited

KOICHI ICHIMURA

International Symposium on Revealing the history of the universe with underground particle and nuclear research 2016　2016/05/11
XMASS実験：中性子による原子核散乱を用いたXMASS検出器の較正

市村晃一, for the, XMASS collaboration

日本物理学会第71回年次大会　2016/03/20
XMASS実験：中性子による原子核散乱を用いたXMASS検出器の較正

市村晃一, for the, XMASS collaboration

日本物理学会 2015年秋季大会　2015/09/27
XMASS detector calibration using neutron source International-presentation

KOICHI ICHIMURA

Light Detection In Noble Elements (LIDINE 2015)　2015/08/28
XMASS1.5, the next step of the XMASS experiment International-presentation

KOICHI ICHIMURA

2015/07/30
XMASS実験：中性子による原子核散乱を用いたXMASS検出器の較正

市村晃一, for the, XMASS collaboration

日本物理学会 2014年秋季大会　2014/09/18
The XMASS experiment International-presentation Invited

KOICHI ICHIMURA

10th Patras Workshop on Axions, WIMPs and WISPs, 2014　2014/06/29
XMASS実験：中性子による原子核散乱を用いたXMASS検出器の較正

市村晃一, for the, XMASS collaboration

日本物理学会第69回年次大会　2014/03/30
CANDLES Project for the Neutrinoless Double Beta Decay of $^{48}$Ca International-presentation

KOICHI ICHIMURA

The 12th Asia Pacific Physics Conference.　2013/07/14
CANDLESによる二重ベータ崩壊の研究(71)-波形解析-

市村晃一, for, the CANDLES collaboration

日本物理学会第68回年次大会　2013/03/29
CANDLESによる二重ベータ崩壊の研究(66)-バックグラウンドシミュレーション-

市村晃一, for, the CANDLES collaboration

日本物理学会 2012年秋季大会　2012/09/11
CANDLEによる二重β崩壊の研究(58)-CANDLES検出器の開発状況-

市村晃一, for, the CANDLES collaboration

日本物理学会第67回年次大会　2012/03/24
Recent Results from the KamLAND International-presentation

KOICHI ICHIMURA

34th International Conference in High Energy Physics　2008/07/30
Background study for the KamLAND reactor neutrino experiment International-presentation

KOICHI ICHIMURA

International Conference on Topics in Astroparticle and Underground Physics　2007/09/11
KamLAND実験における原子炉反ニュートリノの解析(1)

市村晃一, for the KamLAND collaboration

日本物理学会 2004秋季大会　2004/09/27

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Research Projects 17

極低放射能シンチレータ開発によるニュートリノのマヨラナ性の検証

市村晃一, 坂口綾, 丸藤祐仁

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: 東北大学

2024/04 - 2027/03
ZnWO4シンチレータによる方向感度暗黒物質検出器の開発

関谷洋之, 市村晃一, 黒澤俊介, 中島康博

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: 東京大学

2024/04/01 - 2026/03/31
Development of direction sensitive dark matter detector with ZnWO4 scintillators

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

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

Institution: The University of Tokyo

2022/04 - 2026/03
Search for rate decay of 112Sn double electron capture with new generation of gamma-ray spectroscopy

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2022/06 - 2025/03
ガンマ線カロリーメータによる次世代宇宙素粒子実験の開拓

Offer Organization: 東北大学

System: 産総研-東北大マッチング研究支援事業

Institution: 東北大学

2023/04 - 2024/03
次世代宇宙素粒子実験実現のための有機物中RI測定の超高感度化

市村晃一, 坂口綾

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(B)

Category: 基盤研究(B)

Institution: 東北大学

2021/04 - 2024/03
Application of ultra-low background techniques to astro and particle physics experiments

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Yokohama National University

2019/06 - 2024/03
高純度ゲルマニウム検出器を用いたSK-Gd計画等のための放射性不純物量測定 Other

Offer Organization: 東京大学宇宙線研究所

System: 共同利用

2020/04 - 2023/04
次世代宇宙素粒子実験のための有機物中極微量放射性元素の高感度測定手法の確立

Offer Organization: 筑波大学

System: 放射能環境動態・影響評価ネットワーク共同研究拠点（ERAN）

Category: 重点共同研究

2022/04 - 2023/03
A Development for Sterile Neutrino Search in Short Base Line Neutrino Oscillations

Nakamura Kengo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

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

Institution: Tohoku University

2019/04 - 2022/03

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Anomalies became clear as neutrino oscillations have been measured deeply. Sterile neutrino was introduced to solve the anomalies and some experiments were proposed to look for the sterile neutrinos. One of the strategies to solve the anomaly is to measure ultra-short base line neutrino oscillations; a neutrino source is installed right next to a neutrino detector. KamLAND is a low background neutrino detector that has an excellent achievement to measure the reactor neutrino oscillations and that solved the solar neutrino puzzle. A possibility to install the neutrino source in the KamLAND site was discussed and developed in this research.
Search for neutrino-less quadruple beta decay and electron capture with liquid xenon detector

Ichimura Koichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

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

2018/04 - 2021/03

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I have searched for the neutron-less quadruple beta decay of 136Xe in XMASS. The neutrino-less quadruple decay violates the lepton number, and the process can undergo even in the case that neutrino is a Dirac particle.XMASS is an 832 kg liquid xenon detector. Thanks to its low background event rate, and its capability of beta/gamma events separation, this neutrino-less quadruple beta decay search was conducted with high sensitivity. No significant excess from the known background was observed and the first experimental constraint of the half-life of this decay mode was set. I reported this result at the JPS conference. The paper related to this research is under preparation. XMASS also has 124Xe isotopes that can undergo neutrino-less quadruple electron capture. To search for this process, I generated signal and background simulation data. This background simulation data can be used for other physics targets, such as dark matter searches using the whole XMASS data set.
高純度ゲルマニウム検出器を用いた放射性不純物量測定

Offer Organization: 東京大学宇宙線研究所

System: 共同利用

2019/04 - 2020/03
高純度ゲルマニウム検出器を用いた光電子増倍管の放射性不純物量測定

市村晃一

Offer Organization: 東京大学宇宙線研究所

System: 共同利用

2018/04 - 2019/03
A large-scale darkmatter direct-detection experiment

KISHIMOTO Yasuhiro, ABE Ko, SUZUKI Yoichiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: The University of Tokyo

2014/07 - 2019/03

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In order to address to one of the biggest mysteries in the universe, the dark matter, this research project has challenged two tasks: dark matter search with a large-scale experimental apparatus, and development and research of a next-generation dark matter search apparatus. As for the first subject, in this study, we searched for the seasonal modulation signal by dark matter, which the previous research (DAMA / LIBRA) claims, and denied the result. In addition, we searched for dark matter candidates called Bosonic-Super WIMPs, and for the first time published the conclusion that "the vector type cannot be the main component of dark matter". For the second issue, we developed and improved ultra-low background technology.
Study of double beta decay of 48Ca

Tadafumi Kishimoto, NOMACHI Masaharu, YOSHIDA Sei, UMEHARA Saori, OGAWA Izumi, FUSHIMI Ken-ichi, TAMAGAWA Yoichi, OHSUMI Hideaki, AJIMURA Shuhei, ICHIMURA Koichi, IIDA Takashi, NAKAJIMA Kyohei, TAKEMOTO Yasuhiro, FUJII Yasuhiko, MATSUOKA Kenji, NAKATANI Nobuo, TAKIHIRA Yukichi, KAKUBATA Hidekazu, SUZUKI Kotaku, ITO Go, YASUDA Kensuke, TAKUBO Kazuya, TAKEMOTO Jun-ya, WANG Wei, CHAN Wei Min, DOIHARA Masaaki, ISHIKAWA Takashi, Van Thi Thu Trang, SAKA Masayuki, TANAKA Daiki, TANAKA Miho, TOMITA Shohei, FUJITA Tuyoshi, KAWAMURA Atsushi, HARADA Chihiro, OKADA Kenji, OHATA Takaki, TETSUNO Konosuke, MAEDA Tsuyoshi, SAKAMOTO Kosuke, INUKAI Uji, YOSHIIZAWA Masaki, UEHARA Takuma, LEE Syaoron, BATPUREV Temuge, NOSHIRO Shohei, MASUDA Akira, MORISHITA Ken, WASHINO Masaomi, SHOKATI Masoumeh, AKUTAGAWA Kazuki, KATAGIRI Seiya, YOTSUNAGA Naoki, KANEKAWA Kazutaka, Bui Tuan Khai, TSUZUKI Masahito, TAKAHASHI Naruki, TERANISHI Kanau, DOUKAKU Fumiya, KINOSHITA Enki, ISHIKAWA Masahiro, MOSER Michael, MORI Kentaro, HIRAOKA Hirokazu, SHAMOTO Kazuki, SHIMADA Makiko, SATO Hiroyoshi, KAWASAKI Kohei, TOZAWA Masashi, KINO Hidetoshi, SATO Yugo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

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

Institution: Osaka University

2012/05/31 - 2017/03/31

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Creation of matter dominated universe requires violation of lepton number conservation. The violation can be verified by the observation of neutrinoless double beta decay (0nDBD). Our aim is to observe 48Ca 0nDBD with the world best sensitivity by CANDLES system for which we improved performance of the system and developed methods for the enrichment of 48Ca. We installed light pipe, cancellation coil of earth magnetic field and temperature control system which increase light output and lead to improvement of energy resolution. Construction of passive shield leads to reduction of backgrounds by two-orders-of magnitudes. We confirmed that our revised CANDLES III system has sensitivity better than of current limit for 48Ca 0nDBD. We then started long term measurement. We developed enrichment methods by crown-ether resin. A new promising method based on electrophoresis (MCCCE method) was also developed.
Neutron calibration with low energy monochromatic neutron source

Ichimura Koichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

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

Institution: The University of Tokyo

2015/04 - 2017/03

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In this research, we developed a low energy neutron source for dark matter search. From Yttrium (Y88) and Beryllium9 (BeO ceramic), we can obtain almost monochromatic 152 keV neutron via photo-nuclear reaction. Obtained energy spectrum from this calibration source is similar to the few keV nuclear recoils expected from low-mass weakly interacting massive particles. <BR> We developed this source and collected neutrons with helium 3 neutron counter and with XMASS-I experiment detector, which is a dark matter search experiment. Due to insufficient data taking time, it is hard to evaluate the scintillation efficiency and the scintillation decay time constant of this low energy neutron nuclear recoil, which was set for the purpose of this research. However, it was achieved to observe nuclear recoil-like signal from this calibration source.
カムランド実験におけるベリリウム 7 太陽ニュートリノの精密測定による星の進化過程の検証 Competitive

市村晃一

Offer Organization: 日本学術振興会

System: 特別研究員 DC2

2006 - 2008

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Teaching Experience 9

Introductory Science Experiments　Tohoku University
Physics Experiment III　Tohoku University
physics experiment 1　Tohoku University
Introductory Science Experiments　Tohoku University
Physics Experiment III　Tohoku University
Introductory Science Experiments　Tohoku University
Introductory Science Experiments　Tohoku University
自然科学総合実験　東北大学
Introductory Science Experiments　Tohoku University

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Social Activities 2

『きれいな検出器』で探る宇宙の謎（XMASSとSK-Gdを中心に）

第５回研究者トーク

2019/10/13 - 2019/10/13
スーパーサイエンスハイスクール(SSH) スーパーカミオカンデの講義

2019/07/22 - 2019/07/22

Other 1

卓越研究員候補者