東北大学研究者紹介

顔写真

コガ　マサユキ

古賀　真之

Masayuki Koga

所属

ニュートリノ科学研究センター

職名

准教授

学位

博士（理学）（東北大学）
修士（理学）（新潟大学）

researchmap

https://researchmap.jp/read0191581

J-GLOBAL ID

200901011955843495

経歴 4

2004年10月～ 2007年3月

東北大学大学院理学研究科　助教授
2001年4月～ 2004年9月

東北大学大学院理学研究科　助手
1998年4月～ 2001年3月

日本学術振興会特別研究員　特別研究員（ＣＯＥ）
2007年4月～

東北大学大学院理学研究科　准教授

委員歴 2

日本物理学会　領域運営委員

2014年4月～ 2015年3月
日本物理学会　領域運営委員

2014年4月～ 2015年3月

所属学協会 1

日本物理学会

研究キーワード 2

二重ベータ崩壊
ニュートリノ

研究分野 1

自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理にする理論 /

論文 56

Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND

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年5月22日
出版者・発行元：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

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年4月19日
出版者・発行元：American Physical Society (APS)
DOI： 10.1103/physrevd.107.072006 　

ISSN：2470-0010

eISSN：2470-0029
Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen 査読有り

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年1月30日
出版者・発行元：American Physical Society (APS)
DOI： 10.1103/physrevlett.130.051801 　

ISSN：0031-9007

eISSN：1079-7114

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The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in Xe136 using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of Xe136. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the 0νββ decay half-life of T1/20ν>2.3×1026 yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations.
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年10月
出版者・発行元：Elsevier BV
DOI： 10.1016/j.astropartphys.2022.102758 　

ISSN：0927-6505
Abundances of uranium and thorium elements in Earth estimated by geoneutrino spectroscopy 査読有り

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年8月11日
出版者・発行元：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年7月1日
出版者・発行元：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

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

Astrophysical Journal　927　(1)　2022年3月1日

DOI： 10.3847/1538-4357/ac4e7e 　

ISSN：0004-637X

eISSN：1538-4357

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We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts (GRBs) from the Gamma-ray Coordinates Network and Fermi Gamma-ray Burst Monitor. Using a variable coincidence time window of ±500 s plus the duration of each GRB, no statistically significant excess above the background is observed. We place the world's most stringent 90% confidence level upper limit on the electron antineutrino fluence below 17.5 MeV. Assuming a Fermi-Dirac neutrino energy spectrum from the GRB source, we use the available redshift data to constrain the electron antineutrino luminosity and effective temperature.
Limits on Astrophysical Antineutrinos with the KamLAND Experiment

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

Astrophysical Journal　925　(1)　2022年1月20日

DOI： 10.3847/1538-4357/ac32c1 　

ISSN：0004-637X

eISSN：1538-4357

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We report on a search for electron antineutrinos ( ) from astrophysical sources in the neutrino energy range 8.3-30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. Although there is a large background uncertainty from neutral current atmospheric neutrino interactions, we find no significant excess over background model predictions. Assuming several supernova relic neutrino spectra, we give upper flux limits of 60-110 cm-2 s-1 (90% confidence level, CL) in the analysis range and present a model-independent flux. We also set limits on the annihilation rates for light dark matter pairs to neutrino pairs. These data improve on the upper probability limit of 8B solar neutrinos converting into , (90% CL) assuming an undistorted shape. This corresponds to a solar flux of 60 cm-2 s-1 (90% CL) in the analysis energy range.
Search for Solar Flare Neutrinos with the KamLAND Detector

Kamland Collaboration, 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

Astrophysical Journal　924　(2)　2022年1月10日

DOI： 10.3847/1538-4357/ac35d1 　

ISSN：0004-637X

eISSN：1538-4357

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We report the result of a search for neutrinos in coincidence with solar flares from the GOES flare database. The search was performed on a 10.8 kton-year exposure of KamLAND collected from 2002 to 2019. This large exposure allows us to explore previously unconstrained parameter space for solar flare neutrinos. We found no statistical excess of neutrinos and established 90% confidence level upper limits of 8.4 × 107 cm-2 (3.0 × 109 cm-2) on the electron antineutrino (electron neutrino) fluence at 20 MeV normalized to the X12 flare, assuming that the neutrino fluence is proportional to the X-ray intensity.
PICOLON dark matter search project 査読有り

K. Fushimi, D. Chernyak, H. Ejiri, K. Hata, R. Hazama, T. Iida, H. Ikeda, K. Imagawa, K. Inoue, H. Ishiura, H. Ito, T. Kishimoto, M. Koga, K. Kotera, A. Kozlov, K. Nakamura, R. Orito, T. Shima, Y. Takemoto, S. Umehara, Y. Urano, Y. Yamamoto, K. Yasuda, S. Yoshida

Journal of Physics: Conference Series　2156　(1)　012045-012045　2021年12月1日
出版者・発行元：IOP Publishing
DOI： 10.1088/1742-6596/2156/1/012045 　

ISSN：1742-6588

eISSN：1742-6596

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Abstract PICOLON (Pure Inorganic Crystal Observatory for LOw-energy Neutr(al)ino) aims to search for cosmic dark matter by high purity NaI(Tl) scintillator. We developed extremely pure NaI(Tl) crystal by hybrid purification method. The recent result of 210Pb in our NaI(Tl) is less than 5.7 μBq/kg. We will report the test experiment in the low-background measurement at Kamioka Underground Laboratory. The sensitivity for annual modulating signals and finding dark matter particles will be discussed.
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年7月29日
出版者・発行元：Sissa Medialab
DOI： 10.22323/1.395.1163 　
Development of highly radiopure NaI(Tl) scintillator for PICOLON dark matter search project 査読有り

K Fushimi, Y Kanemitsu, S Hirata, D Chernyak, R Hazama, H Ikeda, K Imagawa, H Ishiura, H Ito, T Kisimoto, A Kozlov, Y Takemoto, K Yasuda, H Ejiri, K Hata, T Iida, K Inoue, M Koga, K Nakamura, R Orito, T Shima, S Umehara, S Yoshida

Progress of Theoretical and Experimental Physics　2021　(4)　2021年4月19日
出版者・発行元：Oxford University Press (OUP)
DOI： 10.1093/ptep/ptab020 　

eISSN：2050-3911

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<title>Abstract</title> Highly radiopure NaI(Tl) was developed to search for particle candidates of dark matter. Optimized methods were combined to reduce various radioactive impurities. $^{40}$K was effectively reduced by the recrystallization method. The progenies of the decay chains of uranium and thorium were reduced by appropriate resins. The concentration of natural potassium in NaI(Tl) crystal was reduced to 20 ppb. Concentrations of alpha-ray emitters were successfully reduced by appropriate resin selection. The present concentrations of the thorium series and $^{226}$Ra were $1.2\pm1.4$$\mu$Bq/kg and $13\pm4$$\mu$Bq/kg, respectively. No significant excess in the concentration of $^{210}$Pb was obtained, and the upper limit was 5.7 $\mu$Bq/kg at 90$\#$ CL. The achieved level of radiopurity of NaI(Tl) crystals makes the construction of a dark matter detector possible.
Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events

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年3月1日
出版者・発行元：American Astronomical Society
DOI： 10.3847/1538-4357/abd5bc 　

ISSN：0004-637X

eISSN：1538-4357

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We present the results of a search for MeV-scale electron antineutrino events in KamLAND coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo collaboration during their second and third observing runs. We find no significant coincident signals within a 500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antineutrino fluence between 108 and 1013 cm-2 for neutrino energies in the energy range of 1.8-111 MeV.
Precision Analysis of the136XeTwo-NeutrinoββSpectrum in KamLAND-Zenand Its Impact on the Quenching of Nuclear Matrix Elements 査読有り

A.Gando e

Physical Review Letters　122　(19)　192501-192501-7　2019年5月13日

DOI： 10.1103/PhysRevLett.122.192501 　

ISSN：0031-9007

eISSN：1079-7114
Physics potentials with the second Hyper-Kamiokande detector in Korea 査読有り

The Hyper-Kamiokande, Proto-Collaboration, K Abe

Progress of Theoretical and Experimental Physics　2018　063C01　2018年6月
Kamland-zen

S. Abe, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, K. Hosokawa, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, T. Kinoshita, M. Koga, T. Mitsui, H. Miyake, K. Nakamura, S. Obara, A. Ohno, N. Ohta, S. Ohtsuka, H. Ozaki, T. Sato, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, A. Takeuchi, K. Tamae, K. Ueshima, Y. Wada, H. Watanabe, A. Kozlov, D. Chernyak, Y. Takemoto, S. Umehara, S. Yoshida, K. Fushimi, S. Hirata, B. E. Berger, B. K. Fujikawa, L. A. Winslow, J. Ouellet, E. Krupczak, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, T. O’Donnell, J. A. Detwiler, S. Enomoto, M. P. Decowski

Neutrino 2018 - 28th International Conference on Neutrino Physics and Astrophysics, Conference Proceedings　2018年
A Search for Electron Antineutrinos Associated with Gravitational-wave Events GW150914 and GW151226 Using KamLAND (vol 829, L34, 2016) 査読有り

A. Gando, Y. Gando, T. Hachiya, A. Hayashi, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Karino, M. Koga, S. Matsuda, T. Mitsui, K. Nakamura, S. Obara, T. Oura, H. Ozaki, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, T. Takai, K. Tamae, Y. Teraoka, K. Ueshima, H. Watanabe, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, A. Piepke, T. I. Banks, B. E. Berger, B. K. Fujikawa, T. O'Donnell, J. G. Learned, J. Maricic, M. Sakai, L. A. Winslow, E. Krupczak, J. Ouellet, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

ASTROPHYSICAL JOURNAL LETTERS　851　(1)　1-5　2017年12月
出版者・発行元：IOP PUBLISHING LTD
DOI： 10.3847/2041-8213/aa9a32 　

ISSN：2041-8205

eISSN：2041-8213
Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen 査読有り

A. Gando, Y. Gando, T. Hachiya, A. Hayashi, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Karino, M. Koga, S. Matsuda, T. Mitsui, K. Nakamura, S. Obara, T. Oura, H. Ozaki, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, T. Takai, K. Tamae, Y. Teraoka, K. Ueshima, H. Watanabe, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, T. I. Banks, B. E. Berger, B. K. Fujikawa, T. O'Donnell, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

PHYSICAL REVIEW LETTERS　117　(8)　082503-1-082503-6　2016年8月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevLett.117.082503 　

ISSN：0031-9007

eISSN：1079-7114

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We present an improved search for neutrinoless double-beta (0 nu beta beta) decay of Xe-136 in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the Ag-110m contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0 nu beta beta decay half-life of T-1/2(0 nu) > 1.07 x 10(26) yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.
Search for double-beta decay of Xe-136 to excited states of Ba-136 with the KamLAND-Zen experiment 査読有り

K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara, M. Otani, T. Oura, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, H. Tachibana, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, H. Yoshida, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, T. I. Banks, B. E. Berger, B. K. Fujikawa, T. O'Donnell, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

NUCLEAR PHYSICS A　946　171-181　2016年2月
出版者・発行元：ELSEVIER SCIENCE BV
DOI： 10.1016/j.nuclphysa.2015.11.011 　

ISSN：0375-9474

eISSN：1873-1554

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A search for double-beta decays of Xe-136 to excited states of Ba-136 has been performed with the first phase data set of the KamLAND-Zen experiment. The 0(1)(+), 2(1)(+) and 2(2)(+) transitions of 0 nu beta beta decay were evaluated in an exposure of 89.5 kg. yr of Xe-136, while the same transitions of 2 nu beta beta decay were evaluated in an exposure of 61.8 kg. yr. No excess over background was found for all decay modes. The lower half-life limits of the 2(1)(+) state transitions of 0 nu beta beta and 2 nu beta beta decay were improved to T-1/2(0 nu) (0(+) -> 2(1)(+)) > 2.6 x 10(25) yr and T-1/2(2 nu)) (0(+) -> 2(1)(+)) > 4.6 x 10(23) yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 0(1)(+) Oil-state of Xe-136 for 0 nu beta beta and 2 nu beta beta decay. They are T-1/2(0 nu) (0(+) -> 0(1)(+)) > 2.4 x 10(25) yr and T-1/2(2 nu)(0(+) -> 0(1)(+)) > 8.3 x 10(23) yr (90% C.L.). The transitions to the 22 states are also evaluated for the first time to be T-1/2(0 nu) (0(+) -> 2(2)(+)) > 2.6 x 10(25) yr and T-1/2(2 nu) (0(+) -> 2(2)(+)) > 9.0 x 10(23) yr (90% C.L.). These results are compared to recent theoretical predictions. (C) 2015 Elsevier B.V. All rights reserved.
KamLAND SENSITIVITY TO NEUTRINOS FROM PRE-SUPERNOVA STARS 査読有り

K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara, T. Oura, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, H. Tachibana, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, A. Piepke, T. I. Banks, B. E. Berger, B. K. Fujikawa, T. O'Donnell, J. G. Learned, J. Maricic, S. Matsuno, M. Sakai, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

ASTROPHYSICAL JOURNAL　818　(1)　1-8　2016年2月
出版者・発行元：IOP PUBLISHING LTD
DOI： 10.3847/0004-637X/818/1/91 　

ISSN：0004-637X

eISSN：1538-4357

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In the late stages of nuclear burning for massive stars (M > 8 M-circle dot), the production of neutrino-antineutrino pairs through various processes becomes the dominant stellar cooling mechanism. As the star evolves, the energy of these neutrinos increases and in the days preceding the supernova a significant fraction of emitted electron antineutrinos exceeds the energy threshold for inverse beta decay on free hydrogen. This is the golden channel for liquid scintillator detectors because the coincidence signature allows for significant reductions in background signals. We find that the kiloton-scale liquid scintillator detector KamLAND can detect these pre-supernova neutrinos from a star with a mass of 25 M-circle dot at a distance less than 690 pc with 3 sigma significance before the supernova. This limit is dependent on the neutrino mass ordering and background levels. KamLAND takes data continuously and can provide a supernova alert to the community.
A SEARCH for ELECTRON ANTINEUTRINOS ASSOCIATED with GRAVITATIONAL-WAVE EVENTS GW150914 and GW151226 USING KAMLAND 査読有り

Gando A, Gando Y, Hachiya T, Hayashi A, Hayashida S, Ikeda H, Inoue K, Ishidoshiro K, Karino Y, Koga M, Matsuda S, Mitsui T, Nakamura K, Obara S, Oura T, Ozaki H, Shimizu I, Shirahata Y, Shirai J, Suzuki A, Takai T, Tamae K, Teraoka Y, Ueshima K, Watanabe H, Kozlov A, Takemoto Y, Yoshida S, Fushimi K, Piepke A, Banks T.I, Berger B.E, Fujikawa B.K, O{'}Donnell T, Learned J.G, Maricic J, Sakai M, Winslow L.A, Krupczak E, Ouellet J, Efremenko Y, Karwowski H.J, Markoff D.M, Tornow W, Detwiler J.A, Enomoto S, Decowski M.P

Astrophysical Journal Letters　829　(2)　2016年

DOI： 10.3847/2041-8205/829/2/L34 　
Be-7 solar neutrino measurement with KamLAND 査読有り

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)　055808-055808-8　2015年11月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevC.92.055808 　

ISSN：0556-2813

eISSN：1089-490X

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We report a measurement of the neutrino-electron elastic scattering rate of 862 keV Be-7 solar neutrinos based on a 165.4 kt d exposure of KamLAND. The observed rate is 582 +/- 94(kt d)(-1), which corresponds to an 862-keV Be-7 solar neutrino flux of (3.26 +/- 0.52) x 10(9) cm(-2) s(-1), assuming a pure electron-flavor flux. Comparing this flux with the standard solar model prediction and further assuming three-flavor mixing, a.e survival probability of 0.66 +/- 0.15 is determined from the KamLAND data. Utilizing a global three-flavor oscillation analysis, we obtain a total Be-7 solar neutrino flux of (5.82 +/- 1.02) x 10(9) cm(-2) s(-1), which is consistent with the standard solar model predictions.
Search for the proton decay mode p → ν ¯ K+ with KamLAND SEARCH for the PROTON DECAY MODE ⋯ K. ASAKURA et al

K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, K. Nakamura, S. Obara, Y. Oki, T. Oura, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, H. Tachibana, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, Y. Yamauchi, H. Yoshida, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, C. Grant, A. Piepke, A. Piepke, T. I. Banks, B. E. Berger, B. E. Berger, S. J. Freedman, B. K. Fujikawa, B. K. Fujikawa, T. O'Donnell, T. O'Donnell, J. G. Learned, J. Maricic, M. Sakai, S. Dazeley, R. Svoboda, L. A. Winslow, Y. Efremenko, Y. Efremenko, H. J. Karwowski, H. J. Karwowski, H. J. Karwowski, H. J. Karwowski, D. M. Markoff, W. Tornow, W. Tornow, J. A. Detwiler, S. Enomoto, S. Enomoto, M. P. Decowski, M. P. Decowski

Physical Review D - Particles, Fields, Gravitation and Cosmology　92　2015年9月23日

DOI： 10.1103/PhysRevD.92.052006 　

ISSN：1550-7998

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© 2015 American Physical Society. We present a search for the proton decay mode p→ν¯K+ based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from p→ν¯K+ with unique kinematics, which allow us to achieve a detection efficiency of 44%, higher than previous searches in water Cherenkov detectors. We find no evidence of proton decays for this mode. The expected background, which is dominated by atmospheric neutrinos, is 0.9±0.2 events. The nonbackground-subtracted limit on the partial proton lifetime is τ/B(p→ν¯K+)>5.4×1032years at 90% C.L.
Search for the proton decay mode p→¯νK+ with KamLAND 査読有り

K.Asakura, M.Koga

Phys. Rev. D　92　(5)　052006-1-052006-10　2015年9月
出版者・発行元：None
DOI： 10.1103/PhysRevD.92.052006 　

ISSN：2470-0010

eISSN：2470-0029
STUDY OF ELECTRON ANTI-NEUTRINOS ASSOCIATED WITH GAMMA-RAY BURSTS USING KamLAND 査読有り

K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara, Y. Oki, T. Oura, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, H. Tachibana, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, H. Yoshida, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, A. Piepke, T. I. Banks, B. E. Berger, B. K. Fujikawa, T. O'Donnell, J. G. Learned, J. Maricic, M. Sakai, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

ASTROPHYSICAL JOURNAL　806　(1)　87-1-87-5　2015年6月
出版者・発行元：IOP PUBLISHING LTD
DOI： 10.1088/0004-637X/806/1/87 　

ISSN：0004-637X

eISSN：1538-4357

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We search for electron anti-neutrinos ((V) over bar (e)) from long- and short-duration gamma-ray bursts (GRBs) using data taken by the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND) from 2002 August to 2013 June. No statistically significant excess over the background level is found. We place the tightest upper limits on (V) over bar (e) fluence from GRBs below 7 MeV and place first constraints on the relation between (V) over bar (e) luminosity and effective temperature.
Physics potential of a long-baseline neutrino oscillation experiment using a J-PARC neutrino beam and Hyper-Kamiokande 査読有り

K. Abe, H. Aihara, C. Andreopoulos, I. Anghel, A. Ariga, T. Ariga, R. Asfandiyarov, M. Askins, J. J. Back, P. Ballett, M. Barbi, G. J. Barker, G. Barr, F. Bay, P. Beltrame, V. Berardi, M. Bergevin, S. Berkman, T. Berry, S. Bhadra, F. D. M. Blaszczyk, A. Blondel, S. Bolognesi, S. B. Boyd, A. Bravar, C. Bronner, F. S. Cafagna, G. Carminati, S. L. Cartwright, M. G. Catanesi, K. Choi, J. H. Choi, G. Collazuol, G. Cowan, L. Cremonesi, G. Davies, G. De Rosa, C. Densham, J. Detwiler, D. Dewhurst, F. Di Lodovico, S. Di Luise, O. Drapier, S. Emery, A. Ereditato, P. Fernandez, T. Feusels, A. Finch, M. Fitton, M. Friend, Y. Fujii, Y. Fukuda, D. Fukuda, V. Galymov, K. Ganezer, M. Gonin, P. Gumplinger, D. R. Hadley, L. Haegel, A. Haesler, Y. Haga, B. Hartfiel, M. Hartz, Y. Hayato, M. Hierholzer, J. Hill, A. Himmel, S. Hirota, S. Horiuchi, K. Huang, A. K. Ichikawa, T. Iijima, M. Ikeda, J. Imber, K. Inoue, J. Insler, R. A. Intonti, T. Irvine, T. Ishida, H. Ishino, M. Ishitsuka, Y. Itow, A. Izmaylov, B. Jamieson, H. I. Jang, M. Jiang, K. K. Joo, C. K. Jung, A. Kaboth, T. Kajita, J. Kameda, Y. Karadhzov, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, J. Y. Kim, S. B. Kim, Y. Kishimoto, T. Kobayashi, M. Koga, A. Konaka, L. L. Kormos, A. Korzenev, Y. Koshio, W. R. Kropp, Y. Kudenko, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Laveder, M. Lawe, J. G. Learned, I. T. Lim, T. Lindner, A. Longhin, L. Ludovici, W. Ma, L. Magaletti, K. Mahn, M. Malek, C. Mariani, L. Marti, J. F. Martin, C. Martin, P. P. J. Martins, E. Mazzucato, N. McCauley, K. S. McFarland, C. McGrew, M. Mezzetto, H. Minakata, A. Minamino, S. Mine, O. Mineev, M. Miura, J. Monroe, T. Mori, S. Moriyama, T. Mueller, F. Muheim, M. Nakahata, K. Nakamura, T. Nakaya, S. Nakayama, M. Needham, T. Nicholls, M. Nirkko, Y. Nishimura, E. Noah, J. Nowak, H. Nunokawa, H. M. O'Keeffe, Y. Okajima, K. Okumura, S. M. Oser, E. O'Sullivan, T. Ovsiannikova, R. A. Owen, Y. Oyama, J. Perez, M. Y. Pac, V. Palladino, J. L. Palomino, V. Paolone, D. Payne, O. Perevozchikov, J. D. Perkin, C. Pistillo, S. Playfer, M. Posiadala-Zezula, J. -M. Poutissou, B. Quilain, M. Quinto, E. Radicioni, P. N. Ratoff, M. Ravonel, M. A. Rayner, A. Redij, F. Retiere, C. Riccio, E. Richard, E. Rondio, H. J. Rose, M. Ross-Lonergan, C. Rott, S. D. Rountree, A. Rubbia, R. Sacco, M. Sakuda, M. C. Sanchez, E. Scantamburlo, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, A. Shaikhiev, I. Shimizu, M. Shiozawa, S. Short, G. Sinnis, M. B. Smy, J. Sobczyk, H. W. Sobel, T. Stewart, J. L. Stone, Y. Suda, Y. Suzuki, A. T. Suzuki, R. Svoboda, R. Tacik, A. Takeda, A. Taketa, Y. Takeuchi, H. A. Tanaka, H. K. M. Tanaka, H. Tanaka, R. Terri, L. F. Thompson, M. Thorpe, S. Tobayama, N. Tolich, T. Tomura, C. Touramanis, T. Tsukamoto, M. Tzanov, Y. Uchida, M. R. Vagins, G. Vasseur, R. B. Vogelaar, C. W. Walter, D. Wark, M. O. Wascko, A. Weber, R. Wendell, R. J. Wilkes, M. J. Wilking, J. R. Wilson, T. Xin, K. Yamamoto, C. Yanagisawa, T. Yano, S. Yen, N. Yershov, M. Yokoyama, M. Zito

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS　053C02　(5)　1-35　2015年5月
出版者・発行元：OXFORD UNIV PRESS INC
DOI： 10.1093/ptep/ptv061 　

ISSN：2050-3911

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Hyper-Kamiokande will be a next-generation underground water Cherenkov detector with a total (fiducial) mass of 0.99 (0.56) million metric tons, approximately 20 (25) times larger than that of Super-Kamiokande. One of the main goals of Hyper-Kamiokande is the study of CP asymmetry in the lepton sector using accelerator neutrino and anti-neutrino beams. In this paper, the physics potential of a long-baseline neutrino experiment using the Hyper-Kamiokande detector and a neutrino beam from the J-PARC proton synchrotron is presented. The analysis uses the framework and systematic uncertainties derived from the ongoing T2K experiment. With a total exposure of 7.5 MW x 10(7) s integrated proton beam power (corresponding to 1.56 x 10(22) protons on target with a 30 GeV proton beam) to a 2.5 degrees off-axis neutrino beam, it is expected that the leptonic CP phase delta(CP) can be determined to better than 19 degrees for all possible values of delta(CP), and CP violation can be established with a statistical significance of more than 3 sigma (5 sigma) for 76% (58%) of the delta(CP) parameter space. Using both nu(e) appearance and nu(mu) disappearance data, the expected 1 sigma uncertainty of sin(2) theta(23) is 0.015(0.006) for sin(2) theta(23) = 0.5(0.45).
Results from KamLAND-Zen 査読有り

K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara, Y. Oki, M. Otani, T. Oura, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, H. Tachibana, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, Y. Yamauchi, H. Yoshida, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, T. I. Banks, S. J. Freedman, B. K. Fujikawa, T. O'Donnell, L. A. Winslow, B. E. Berger, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

XXVI INTERNATIONAL CONFERENCE ON NEUTRINO PHYSICS AND ASTROPHYSICS (NEUTRINO 2014)　1666　170003-1-170003-8　2015年
出版者・発行元：AMER INST PHYSICS
DOI： 10.1063/14915593 　

ISSN：0094-243X

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KamLAND-Zen reports on a preliminary search for neutrinoless double-beta decay with Xe-136 based on 114.8 live-days after the purification of the xenon loaded liquid scintillator. In this data, the problematic Ag-11 m background peak identified in previous searches is reduced by more than a factor of 10. By combining the KamLAND-Zen pre- and post-purification data, we obtain a preliminary lower limit on the 0 nu beta beta decay half-life of T-1/2(0 nu) > 2.6 x 10(25) yr at 90% C.L. The search sensitivity will be enhanced with additional low background data after the purification. Prospects for further improvements with future KamLAND-Zen upgrades are also presented.
Laboratory studies on the removal of radon-born lead from KamLAND's organic liquid scintillator 査読有り

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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　769　79-87　2015年1月
出版者・発行元：ELSEVIER SCIENCE BV
DOI： 10.1016/j.nima.2014.09.050 　

ISSN：0168-9002

eISSN：1872-9576

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The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques developed to measure and efficiently extract radon decay products from liquid scintillator. We report the radio-isotope reduction factors obtained when applying various extraction methods. During this study, distillation was identified as the most efficient method for removing radon-born lead from liquid scintillator. Published by Elsevier B.V.
A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector 査読有り

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年1月
出版者・発行元：ELSEVIER SCIENCE BV
DOI： 10.1016/j.nima.2014.09.068 　

ISSN：0168-9002

eISSN：1872-9576

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We describe a compact, ultra-clean device used to deploy radioactive sources along the vertical axis of the KamLAND liquid-scintillator neutrino detector for purposes of calibration. The device worked by paying out and reeling in precise lengths of a hanging, small-gauge wire rope (cable); an assortment of interchangeable radioactive sources could be attached to a weight at the end of the cable. All components exposed to the radiopure liquid scintillator were made of chemically compatible UHV-cleaned materials, primarily stainless steel, in order to avoid contaminating or degrading the scintillator. To prevent radon intrusion, the apparatus was enclosed in a hermetically sealed housing inside a glove box, and both volumes were regularly flushed with purified nitrogen gas. An infrared camera attached to the side of the housing permitted real-Lime visual monitoring of the cable's motion, and the system was controlled via a graphical user interface. (C) 2014 Elsevier B.V. All rights reserved.
CeLAND: search for a 4th light neutrino state with a 3 PBq 144Ce-144Pr electron antineutrino generator in KamLAND

A. Gando, Y. Gando, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, Y. Oki, M. Otani, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, Y. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, Y. Yamauchi, H. Yoshida, M. Cribier, M. Durero, V. Fischer, J. Gaffiot, N. Jonqueres, A. Kouchner, T. Lasserre, D. Leterme, A. Letourneau, D. Lhuillier, G. Mention, G. Rampal, L. Scola, Ch. Veyssiere, M. Vivier, P. Yala, B. E. Berger, A. Kozlov, T. Banks, D. Dwyer, B. K. Fujikawa, K. Han, Yu. G. Kolomensky, Y. Mei, T. O'Donnell, P. Decowski, D. M. Markoff, S. Yoshida, V. N. Kornoukhov, T. V, M. Gelis, G. V. Tikhomirov, J. G. Learned, J. Maricic, S. Matsuno, R. Milincic, H. J. Karwowski, Y. Efremenko, A. Detwiler, S. Enomoto

2013年12月4日

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The reactor neutrino and gallium anomalies can be tested with a 3-4 PBq (75-100 kCi scale) 144Ce-144Pr antineutrino beta-source deployed at the center or next to a large low-background liquid scintillator detector. The antineutrino generator will be produced by the Russian reprocessing plant PA Mayak as early as 2014, transported to Japan, and deployed in the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND) as early as 2015. KamLAND's 13 m diameter target volume provides a suitable environment to measure the energy and position dependence of the detected neutrino flux. A characteristic oscillation pattern would be visible for a baseline of about 10 m or less, providing a very clean signal of neutrino disappearance into a yet-unknown, sterile neutrino state. This will provide a comprehensive test of the electron dissaperance neutrino anomalies and could lead to the discovery of a 4th neutrino state for Delta_m^2 > 0.1 eV^2 and sin^2(2theta) > 0.05.
Reactor on-off antineutrino measurement with KamLAND 査読有り

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, A. Obata, A. Oki, Y. Oki, M. Otani, I. Shimizu, J. Shirai, A. Suzuki, Y. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, Y. Yamauchi, H. Yoshida, A. Kozlov, S. Yoshida, A. Piepke, T. I. Banks, B. K. Fujikawa, K. Han, T. O'Donnell, B. E. Berger, J. G. Learned, S. Matsuno, M. Sakai, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

Physical Review D - Particles, Fields, Gravitation and Cosmology　88　(3)　033001-1-033001-10　2013年8月2日

DOI： 10.1103/PhysRevD.88.033001 　

ISSN：1550-7998 1550-2368

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The recent long-term shutdown of Japanese nuclear reactors has resulted in a significantly reduced reactor ν̄e flux at KamLAND. This running condition provides a unique opportunity to confirm and constrain backgrounds for the reactor ν̄e oscillation analysis. The data set also has improved sensitivity for other ν̄e signals, in particular ν̄e's produced in β-decays from U238 and Th232 within the Earth's interior, whose energy spectrum overlaps with that of reactor ν̄e's. Including constraints on θ13 from accelerator and short-baseline reactor neutrino experiments, a combined three-flavor analysis of solar and KamLAND data gives fit values for the oscillation parameters of tan2θ12=0.436-0.025+0.029, Δm212=7.53-0.18+0.18×10-5 eV2, and sin2θ13=0.023-0.002+0.002. Assuming a chondritic Th/U mass ratio, we obtain 116-27+28 ν̄e events from U238 and Th232, corresponding to a geo ν̄e flux of 3.4-0.8+0.8×106 cm-2 s-1 at the KamLAND location. We evaluate various bulk silicate Earth composition models using the observed geo ν̄e rate. © 2013 American Physical Society.
Limit on neutrinoless ββ decay of Xe136 from the first phase of KamLAND-Zen and comparison with the positive claim in Ge76 査読有り

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro, R. Kato, M. Koga, S. Matsuda, T. Mitsui, D. Motoki, T. Nakada, K. Nakamura, A. Obata, A. Oki, Y. Ono, M. Otani, I. Shimizu, J. Shirai, A. Suzuki, Y. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, H. Yoshida, A. Kozlov, S. Yoshida, T. I. Banks, S. J. Freedman, B. K. Fujikawa, K. Han, T. O'Donnell, B. E. Berger, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

Physical Review Letters　110　(6)　062502-1-062502-5　2013年2月7日

DOI： 10.1103/PhysRevLett.110.062502 　

ISSN：0031-9007 1079-7114

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We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of Xe136. We obtain a lower limit for the neutrinoless double-beta decay half-life of T1/20ν&gt 1.9×1025 yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T1/20ν&gt 3.4×1025 yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of mββ &lt (120-250) meV based on a representative range of available matrix element calculations. Using those calculations, this result excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay detection claim in Ge76, reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L. © 2013 American Physical Society.
Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment 査読有り

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, R. Kato, M. Koga, S. Matsuda, T. Mitsui, T. Nakada, K. Nakamura, A. Obata, A. Oki, Y. Ono, I. Shimizu, J. Shirai, A. Suzuki, Y. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, H. Yoshida, A. Kozlov, S. Yoshida, T. I. Banks, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, T. O'Donnell, B. E. Berger, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Enomoto, M. P. Decowski

PHYSICAL REVIEW C　86　(2)　021601-021604　2012年8月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevC.86.021601 　

ISSN：0556-2813

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We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay half-life of 136Xe is obtained as T-1/2(0 nu chi 0) > 2.6 x 10(24) yr at 90% C. L., a factor of five more stringent than previous limits. The corresponding upper limit on the effective Majoron-neutrino coupling, using a range of available nuclear matrix calculations, is < g(ee)> < (0.8-1.6) x 10(-5). This excludes a previously unconstrained region of parameter space and strongly limits the possible contribution of ordinary Majoron emission modes to 0 nu beta beta decay for neutrino masses in the inverted hierarchy scheme.
Measurement of the double-beta decay half-life of Xe-136 with the KamLAND-Zen experiment 査読有り

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, R. Kato, M. Koga, S. Matsuda, T. Mitsui, T. Nakada, K. Nakamura, A. Obata, A. Oki, Y. Ono, I. Shimizu, J. Shirai, A. Suzuki, Y. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, H. Yoshida, A. Kozlov, S. Yoshida, T. I. Banks, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, T. O'Donnell, B. E. Berger, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Enomoto, M. P. Decowski

PHYSICAL REVIEW C　85　(4)　045504-045509　2012年4月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevC.85.045504 　

ISSN：0556-2813

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We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of Xe-136. The measured two-neutrino double-beta decay half-life of Xe-136 is T-1/2(2 nu) = 2.38 +/- 0.02(stat) +/- 0.14(syst) x 10(21) yr, consistent with a recent measurement by EXO-200. We also obtain a lower limit for the neutrinoless double-beta decay half-life, T-1/2(0 nu) > 5.7 x 10(24) yr at 90% confidence level (C. L.), which corresponds to almost a fivefold improvement over previous limits.
SEARCH FOR EXTRATERRESTRIAL ANTINEUTRINO SOURCES WITH THE KamLAND DETECTOR 査読有り

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)　193-1-193-8　2012年2月
出版者・発行元：IOP PUBLISHING LTD
DOI： 10.1088/0004-637X/745/2/193 　

ISSN：0004-637X

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We present the results of a search for extraterrestrial electron antineutrinos ((nu) over bar (e)'s) in the energy range 8.3 MeV E-<(nu) over bare < 31.8 MeV using the KamLAND detector. In an exposure of 4.53 kton-year, we identify 25 candidate events. All of the candidate events can be attributed to background, most importantly neutral current atmospheric neutrino interactions, setting an upper limit on the probability of B-8 solar nu(e)'s converting into nu(e)'s at 5.3 x 10(-5) (90% CL), if we assume an undistorted nu(e) shape. This limit corresponds to a solar nu(e) flux of 93 cm(-2) s(-1) or an event rate of 1.6 events (kton-year)(-1) above the energy threshold (E-<(nu)over bar>e >= 8.3 MeV). The present data also allows us to set more stringent limits on the diffuse supernova neutrino flux and on the annihilation rates for light dark matter particles.
Measurement of the B-8 solar neutrino flux with the KamLAND liquid scintillator detector 査読有り

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)　035804-1-035804-6　2011年9月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevC.84.035804 　

ISSN：0556-2813

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We report a measurement of the neutrino-electron elastic scattering rate from B-8 solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5-MeV analysis threshold is 1.49 +/- 0.14(stat) +/- 0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a B-8 neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77 +/- 0.26(stat) +/- 0.32(syst) x 10(6) cm(-2)s(-1). The analysis threshold is driven by Tl-208 present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic Be-11. The measured rate is consistent with existing measurements and with standard solar model predictions which include matter-enhanced neutrino oscillation.
Partial radiogenic heat model for Earth revealed by geoneutrino measurements 査読有り

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年9月
出版者・発行元：NATURE PUBLISHING GROUP
DOI： 10.1038/ngeo1205 　

ISSN：1752-0894

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The Earth has cooled since its formation, yet the decay of radiogenic isotopes, and in particular uranium, thorium and potassium, in the planet's interior provides a continuing heat source. The current total heat flux from the Earth to space is 44.2 +/- 1.0 TW, but the relative contributions from residual primordial heat and radiogenic decay remain uncertain. However, radiogenic decay can be estimated from the flux of geoneutrinos, electrically neutral particles that are emitted during radioactive decay and can pass through the Earth virtually unaffected. Here we combine precise measurements of the geoneutrino flux from the Kamioka Liquid-Scintillator Antineutrino Detector, Japan, with existing measurements from the Borexino detector, Italy. We find that decay of uranium-238 and thorium-232 together contribute 20.0(-8.6)(+8.8) TW to Earth's heat flux. The neutrinos emitted from the decay of potassium-40 are below the limits of detection in our experiments, but are known to contribute 4 TW. Taken together, our observations indicate that heat from radioactive decay contributes about half of Earth's total heat flux. We therefore conclude that Earth's primordial heat supply has not yet been exhausted.
Constraints on theta(13) from a three-flavor oscillation analysis of reactor antineutrinos at KamLAND 査読有り

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)　052002-052011　2011年3月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevD.83.052002 　

ISSN：1550-7998

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We present new constraints on the neutrino oscillation parameters Delta m(21)(2), theta(12), and theta(13) from a three-flavor analysis of solar and KamLAND data. The KamLAND data set includes data acquired following a radiopurity upgrade and amounts to a total exposure of 3.49 x 10(32) target-proton-year. Under the assumption of CPT invariance, a two-flavor analysis (theta(13) = 0) of the KamLAND and solar data yields the best-fit values tan(2)theta(12) = 0.444(-0.030)(+0.036) and Delta m(21)(2) = 7.50(-0.20)(+0.19) x 10(-5) eV(2); a three-flavor analysis with theta(13) as a free parameter yields the best-fit values tan(2)theta(12) = 0.452(-0.033)(+0.035), Delta m(21)(2) = 7.50(-0.20)(+0.19) x 10(-5) eV(2), and sin(2)theta(13) = 0.020(-0.016)(+0.016). This theta(13) interval is consistent with other recent work combining the CHOOZ, atmospheric and long-baseline accelerator experiments. We also present a new global theta(13) analysis, incorporating the CHOOZ, atmospheric, and accelerator data, which indicates sin(2)theta(13) = 0.009(-0.007)(+0.013). A nonzero value is suggested, but only at the 79% C.L.
Production of radioactive isotopes through cosmic muon spallation in KamLAND

S. Abe, S. Enomoto, S. Enomoto, K. Furuno, Y. Gando, H. Ikeda, K. Inoue, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, M. Koga, Y. Minekawa, T. Mitsui, K. Nakajima, K. Nakajima, K. Nakajima, K. Nakamura, 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, H. Murayama, J. Busenitz, T. Classen, T. Classen, C. Grant, G. Keefer, D. S. Leonard, D. S. Leonard, D. McKee, D. McKee, A. Piepke, A. Piepke, T. I. Banks, T. Bloxham, J. A. Detwiler, S. J. Freedman, S. J. Freedman, B. K. Fujikawa, B. K. Fujikawa, F. Gray, F. Gray, E. Guardincerri, L. Hsu, L. Hsu, K. Ichimura, R. Kadel, C. Lendvai, K. B. Luk, T. O'Donnell, H. M. Steiner, L. A. Winslow, L. A. Winslow, D. A. Dwyer, C. Jillings, C. Jillings, C. Mauger, 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, G. A. Horton-Smith, A. Tang, S. Dazeley, S. Dazeley, K. E. Downum, G. Gratta, K. Tolich, K. Tolich, W. Bugg, Y. Efremenko, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, H. J. Karwowski, D. M. Markoff, D. M. Markoff

Physical Review C - Nuclear Physics　81　2010年2月23日

DOI： 10.1103/PhysRevC.81.025807 　

ISSN：0556-2813

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Radioactive isotopes produced through cosmic muon spallation are a background for rare-event detection in ν detectors, double-β-decay experiments, and dark-matter searches. Understanding the nature of cosmogenic backgrounds is particularly important for future experiments aiming to determine the pep and CNO solar neutrino fluxes, for which the background is dominated by the spallation production of C11. Data from the Kamioka liquid-scintillator antineutrino detector (KamLAND) provides valuable information for better understanding these backgrounds, especially in liquid scintillators, and for checking estimates from current simulations based upon MUSIC, FLUKA, and GEANT4. Using the time correlation between detected muons and neutron captures, the neutron production yield in the KamLAND liquid scintillator is measured to be Yn=(2.8±0.3)×10-4μ-1g-1cm2. For other isotopes, the production yield is determined from the observed time correlation related to known isotope lifetimes. We find some yields are inconsistent with extrapolations based on an accelerator muon beam experiment. © 2010 The American Physical Society.
Production of radioactive isotopes through cosmic muon spallation in KamLAND 査読有り

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　81　(2)　025807-025822　2010年2月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevC.81.025807 　

ISSN：2469-9985

eISSN：2469-9993

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Radioactive isotopes produced through cosmic muon spallation are a background for rare-event detection in. detectors, double-beta-decay experiments, and dark-matter searches. Understanding the nature of cosmogenic backgrounds is particularly important for future experiments aiming to determine the pep and CNO solar neutrino fluxes, for which the background is dominated by the spallation production of C-11. Data from the Kamioka liquid-scintillator antineutrino detector (KamLAND) provides valuable information for better understanding these backgrounds, especially in liquid scintillators, and for checking estimates from current simulations based upon MUSIC, FLUKA, and GEANT4. Using the time correlation between detected muons and neutron captures, the neutron production yield in the KamLAND liquid scintillator is measured to be Y-n = (2.8 +/- 0.3) x 10(-4) mu(-1) g(-1) cm(2). For other isotopes, the production yield is determined from the observed time correlation related to known isotope lifetimes. We find some yields are inconsistent with extrapolations based on an accelerator muon beam experiment.
The KamLAND full-volume calibration system 査読有り

B. E. Berger, J. Busenitz, T. Classen, M. P. Decowski, D. A. Dwyer, G. Elor, A. Frank, S. J. Freedman, B. K. Fujikawa, K. M. Galloway, F. Gray, 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　(4)　04017-04044　2009年

DOI： 10.1088/1748-0221/4/04/P04017 　

ISSN：1748-0221

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We have successfully built and operated a source deployment system for the KamLAND detector. This system was used to position radioactive sources throughout the delicate 1-kton liquid scintillator volume, while meeting stringent material cleanliness, material compatibility, and safety requirements. The calibration data obtained with this device were used to fully characterize detector position and energy reconstruction biases. As a result, the uncertainty in the size of the detector fiducial volume was reduced by a factor of two. Prior to calibration with this system, the fiducial volume was the largest source of systematic uncertainty in measuring the number of antineutrinos detected by KamLAND. This paper describes the design, operation and performance of this unique calibration system. © 2009 IOP Publishing Ltd and SISSA.
Precision Measurement of Neutrino Oscillation Parameters with KamLAND (vol 100, artn 221803, 2008) 査読有り

S. Abe, T. Ebihara, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Shimizu, A. Kozlov, Y. Minekawa, T. Mitsui, K. Nakajima, K. Nakajima, K. Nakamura, M. Nakamura, K. Owada, I. 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　101　(25)　2008年12月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevLett.101.259901 　

ISSN：0031-9007
Erratum: Precision measurement of neutrino oscillation parameters with KamLAND (Physical Review Letters (2008) 100 (221803))

S. Abe, T. Ebihara, S. Enomoto, K. Furuno, Y. Gando, K. Ichimura, H. Ikeda, K. Inoue, Y. Kibe, Y. Kishimoto, M. Koga, Y. Shimizu, A. Kozlov, Y. Minekawa, T. Mitsui, K. Nakajima, K. Nakajima, K. Nakamura, M. Nakamura, K. Owada, I. 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　101　2008年9月12日

DOI： 10.1103/PhysRevLett.101.119904 　

ISSN：0031-9007
Precision measurement of neutrino oscillation parameters with KamLAND

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. 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, F. Gray, E. Guardincerri, L. Hsu, 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. 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, S. Dazeley, K. E. Downum, G. Gratta, K. Tolich, W. Bugg, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. J. Karwowski, H. J. Karwowski, H. J. Karwowski, D. M. Markoff, D. M. Markoff, D. M. Markoff, W. Tornow, W. Tornow, W. Tornow, K. M. Heeger, F. Piquemal, J. S. Ricol

Physical Review Letters　100　(22)　221803-221803　2008年6月5日
出版者・発行元：American Physical Society
DOI： 10.1103/PhysRevLett.100.221803 　

ISSN：0031-9007

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The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Δm212 and stringent constraints on θ12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44×1032protonyr due to longer livetime and an enlarged fiducial volume. An undistorted reactor ν̄e energy spectrum is now rejected at >5σ. Analysis of the reactor spectrum above the inverse beta decay energy threshold, and including geoneutrinos, gives a best fit at Δm212=7.58-0.13+0.14(stat)-0.15+0.15(syst)×10-5eV2 and tan 2θ12=0.56-0.07+0.10(stat)-0.06+0.10(syst). Local Δχ2 minima at higher and lower Δm212 are disfavored at >4σ. Combining with solar neutrino data, we obtain Δm212=7.59-0.21+0.21×10-5eV2 and tan 2θ12=0.47-0.05+0.06. © 2008 The American Physical Society.
Search for the invisible decay of neutrons with KamLAND 査読有り

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)　101802　2006年3月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevLett.96.101802 　

ISSN：0031-9007

eISSN：1079-7114

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The Kamioka Liquid scintillator Anti-Neutrino Detector is used in a search for single neutron or two-neutron intranuclear disappearance that would produce holes in the s-shell energy level of C-12 nuclei. Such holes could be created as a result of nucleon decay into invisible modes (inv), e.g., n -> 3 nu or nn -> 2 nu. The deexcitation of the corresponding daughter nucleus results in a sequence of space and time-correlated events observable in the liquid scintillator detector. We report on new limits for one- and two-neutron disappearance: tau(n -> inv)> 5.8x10(29) years and tau(nn -> inv)> 1.4x10(30) years at 90% C.L. These results represent an improvement of factors of similar to 3 and > 10(4) over previous experiments.
Experimental investigation of geologically produced antineutrinos with KamLAND 査読有り

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年7月
出版者・発行元：NATURE PUBLISHING GROUP
DOI： 10.1038/nature03980 　

ISSN：0028-0836

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The detection of electron antineutrinos produced by natural radioactivity in the Earth could yield important geophysical information. The Kamioka liquid scintillator antineutrino detector (KamLAND) has the sensitivity to detect electron antineutrinos produced by the decay of U-238 and Th-232 within the Earth. Earth composition models suggest that the radiogenic power from these isotope decays is 16 TW, approximately half of the total measured heat dissipation rate from the Earth. Here we present results from a search for geoneutrinos with KamLAND. Assuming a Th/U mass concentration ratio of 3.9, the 90 per cent confidence interval for the total number of geoneutrinos detected is 4.5 to 54.2. This result is consistent with the central value of 19 predicted by geophysical models. Although our present data have limited statistical power, they nevertheless provide by direct means an upper limit (60 TW) for the radiogenic power of U and Th in the Earth, a quantity that is currently poorly constrained.
Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion 査読有り

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)　081801　2005年3月
出版者・発行元：AMERICAN PHYSICAL SOC
DOI： 10.1103/PhysRevLett.94.081801 　

ISSN：0031-9007

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We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 (ν) over bar (e) candidate events with energies above 3.4 MeV compared to 365.2+/-23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8+/-7.3 expected background events, the statistical significance for reactor (ν) over bar (e) disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from (ν) over bar (e) oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Deltam(2)=7.9(-0.5)(+0.6)x10(-5) eV(2). A global analysis of data from KamLAND and solar-neutrino experiments yields Deltam(2)=7.9(-0.5)(+0.6)x10(-5) eV(2) and tan(2)theta=0.40(-0.07)(+0.10), the most precise determination to date.
A High Sensitivity search for Anti-νe’s from the Sun and Other Sources at KamLAND 査読有り

K.Eguchi, et

Physical Review Letters　92　(7)　071301-071305　2004年2月
出版者・発行元：None
DOI： 10.1103/PhysRevLett.92.071301 　

ISSN：0031-9007
The Super-Kamiokande detector 査読有り

S Fukuda, Y Fukuda, T Hayakawa, E Ichihara, M Ishitsuka, Y Itow, T Kajita, J Kameda, K Kaneyuki, S Kasuga, K Kobayashi, Y Kobayashi, Y Koshio, M Miura, S Moriyama, M Nakahata, S Nakayama, T Namba, Y Obayashi, A Okada, M Oketa, K Okumura, T Oyabu, N Sakurai, M Shiozawa, Y Suzuki, Y Takeuchi, T Toshito, Y Totsuka, S Yamada, S Desai, M Earl, JT Hong, E Kearns, M Masuzawa, MD Messier, JL Stone, LR Sulak, CW Walter, W Wang, K Scholberg, T Barszczak, D Casper, DW Liu, W Gajewski, PG Halverson, J Hsu, WR Kropp, S Mine, LR Price, F Reines, M Smy, HW Sobel, MR Vagins, KS Ganezer, WE Keig, RW Ellsworth, S Tasaka, JW Flanagan, A Kibayashi, JG Learned, S Matsuno, VJ Stenger, Y Hayato, T Ishii, A Ichikawa, J Kanzaki, T Kobayashi, T Maruyama, K Nakamura, Y Oyama, A Sakai, M Sakuda, O Sasaki, S Echigo, T Iwashita, M Kohama, AT Suzuki, M Hasegawa, T Inagaki, Kato, I, H Maesaka, T Nakaya, K Nishikawa, S Yamamoto, TJ Haines, BK Kim, R Sanford, R Svoboda, E Blaufuss, ML Chen, Z Conner, JA Goodman, E Guillian, GW Sullivan, D Turcan, A Habig, M Ackerman, F Goebel, J Hill, CK Jung, T Kato, D Kerr, M Malek, K Martens, C Mauger, C McGrew, E Sharkey, B Viren, C Yanagisawa, W Doki, S Inaba, K Ito, M Kirisawa, M Kitaguchi, C Mitsuda, K Miyano, C Saji, M Takahata, M Takahashi, K Higuchi, Y Kajiyama, A Kusano, Y Nagashima, K Nitta, M Takita, T Yamaguchi, M Yoshida, HI Kim, SB Kim, J Yoo, H Okazawa, M Etoh, K Fujita, Y Gando, A Hasegawa, T Hasegawa, S Hatakeyama, K Inoue, K Ishihara, T Iwamoto, M Koga, Nishiyama, I, H Ogawa, J Shirai, A Suzuki, T Takayama, F Tsushima, M Koshiba, Y Ichikawa, T Hashimoto, Y Hatakeyama, M Koike, T Horiuchi, M Nemoto, K Nishijima, H Takeda, H Fujiyasu, T Futagami, H Ishino, Y Kanaya, M Morii, H Nishihama, H Nishimura, T Suzuki, Y Watanabe, D Kielczewska, U Golebiewska, HG Berns, SB Boyd, RA Doyle, JS George, AL Stachyra, LL Wai, RJ Wilkes, KK Young, H Kobayashi

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　501　(2-3)　418-462　2003年4月
出版者・発行元：ELSEVIER SCIENCE BV
DOI： 10.1016/S0168-9002(03)00425-X 　

ISSN：0168-9002

eISSN：1872-9576

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Super-Kamiokande is the world's largest water Cherenkov detector, with net mass 50,000 tons. During the period April, 1996 to July, 2001, Super-Kamiokande I collected 1678 live-days of data, observing neutrinos from the Sun, Earth's atmosphere, and the K2K long-baseline neutrino beam with high efficiency. These data provided crucial information for our current understanding of neutrino oscillations, as well as setting stringent limits on nucleon decay. In this paper, we describe the detector in detail, including its site, configuration, data acquisition equipment, online and offline software, and calibration systems which were used during Super-Kamiokande I. (C) 2003 Elsevier Science B.V. All rights reserved.
First results from KamLAND: Evidence for reactor antineutrino disappearance 査読有り

K Eguchi, S Enomoto, K Furuno, J Goldman, H Hanada, H Ikeda, K Ikeda, K Inoue, K Ishihara, W Itoh, T Iwamoto, T Kawaguchi, T Kawashima, H Kinoshita, Y Kishimoto, M Koga, Y Koseki, T Maeda, T Mitsui, M Motoki, K Nakajima, M Nakajima, T Nakajima, H Ogawa, K Owada, T Sakabe, Shimizu, I, J Shirai, F Suekane, A Suzuki, K Tada, O Tajima, T Takayama, K Tamae, H Watanabe, J Busenitz, Z Djurcic, K McKinny, DM Mei, A Piepke, E Yakushev, BE Berger, YD Chan, MP Decowski, DA Dwyer, SJ Freedman, Y Fu, BK Fujikawa, KM Heeger, KT Lesko, KB Luk, H Murayama, DR Nygren, CE Okada, AWP Poon, HM Steiner, LA Winslow, GA Horton-Smith, RD McKeown, J Ritter, B Tipton, P Vogel, CE Lane, T Miletic, PW Gorham, G Guillian, JG Learned, J Maricic, S Matsuno, S Pakvasa, S Dazeley, S Hatakeyama, M Murakami, RC Svoboda, BD Dieterle, M DiMauro, J Detwiler, G Gratta, K Ishii, N Tolich, Y Uchida, M Batygov, W Bugg, H Cohn, Y Efremenko, Y Kamyshkov, A Kozlov, Y Nakamura, LD Braeckeleer, CR Gould, HJ Karwowski, DM Markoff, JA Messimore, K Nakamura, RM Rohm, W Tornow, AR Young, YF Wang

PHYSICAL REVIEW LETTERS　90　(2)　021802-021807　2003年1月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevLett.90.021802 　

ISSN：0031-9007

eISSN：1079-7114

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KamLAND has measured the flux of (nu) over bar (e)'s from distant nuclear reactors. We find fewer (nu) over bar (e) events than expected from standard assumptions about (nu) over bar (e) propagation at the 99.95% C.L. In a 162 ton.yr exposure the ratio of the observed inverse beta-decay events to the expected number without (nu) over bar (e) disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for (nu) over bar (e) energies >3.4 MeV. In the context of two-flavor neutrino oscillations with CPT invariance, all solutions to the solar neutrino problem except for the "large mixing angle" region are excluded.
Measurement of the flux and zenith angle distribution of upward through going muons by Super-Kamiokande 査読有り

Fukuda, Y., Hayakawa, T., Ichihara, E., Inoue, K., Ishihara, K., Ishino, H., Itow, Y., Kajita, T., Kameda, J., Kasuga, S., Kobayashi, K., Kobayashi, Y., Koshio, Y., Miura, M., Nakahata, M., Nakayama, S., Okada, A., Okumura, K., Sakurai, N., Shiozawa, M., Suzuki, Y., Takeuchi, Y., Totsuka, Y., Yamada, S., Earl, M., Habig, Alec, Kearns, E., Messier, M.D., Scholberg, K., Stone, J.L., Sulak, L.R., Walter, C.W., Goldhaber, M., Barszczak, T., Casper, D., Gajewski, W., Kropp, W.R., Price, L.R., Reines, F., Smy, M., Sobel, H.W., Vagins, M.R., Ganezer, K.S., Keig, W.E., Ellsworth, R.W., Tasaka, S., Flanagan, J.W., Kibayashi, A., Learned, J.G., Matsuno, S., Stenger, V.J., Takemori, D., Ishii, T., Kanzaki, J., Kobayashi, T., Mine, S., Nakamura, K., Nishikawa, K., Oyama, Y., Sakai, A., Sakuda, M., Sasaki, Osamu, Echigo, S., Kohama, M., Suzuki, A.T., Haines, T.J., Blaufuss, E., Kim, B.K., Sanford, R., Svoboda, R., Chen, M.L., Goodman, J.A., Sullivan, G.W., Hill, J., Jung, C.K., Martens, K., Mauger, C., McGrew, C., Sharkey, E., Viren, B., Yanagisawa, C., Doki, W., Miyano, K., Okazawa, H., Saji, C., Takahata, M., Nagashima, Y., Takita, M., Yamaguchi, T., Yoshida, M., Kim, S.B., Etoh, M., Fujita, K., Hasegawa, A., Hasegawa, T., Hatakeyama, S., Iwamoto, T., Koga, M., Maruyama, T., Ogawa, H., Shirai, J., Suzuki, A., Tsushima, F., Koshiba, M., Nemoto, M., Nishijima, K., Futagami, T., Hayato, Y., Kanaya, Y., Kaneyuki, K., Watanabe, Y., Kielczewska, D., Doyle, R.A., George, J.S., Stachyra, A.L., Wai, L.L., Wilkes, R.J., Young, K.K.

Phys.Rev.Lett.　82　(13)　2644-2648　1999年

DOI： 10.1103/PhysRevLett.82.2644 　
Neutrino induced upward stopping muons in Super-Kamiokande 査読有り

Fukuda, Y., Ishihara, K., Itow, Y., Kajita, T., Kameda, J., Kasuga, S., Kobayashi, K., Kobayashi, Y., Koshio, Y., Miura, M., Nakahata, M., Nakayama, S., Obayashi, Y., Okada, A., Okumura, K., Sakurai, N., Shiozawa, M., Suzuki, Y., Takeuchi, H., Takeuchi, Y., Totsuka, Y., Yamada, S., Earl, M., Habig, Alec, Kearns, E., Messier, M.D., Scholberg, K., Stone, J.L., Sulak, L.R., Walter, C.W., Goldhaber, M., Barszczak, T., Casper, D., Gajewski, W., Kropp, W.R., Mine, S., Price, L.R., Smy, M., Sobel, H.W., Vagins, M.R., Ganezer, K.S., Keig, W.E., Ellsworth, R.W., Tasaka, S., Kibayashi, A., Learned, J.G., Matsuno, S., Stenger, V.J., Takemori, D., Ishii, T., Ishino, H., Kobayashi, T., Nakamura, K., Oyama, Y., Sakai, A., Sakuda, M., Sasaki, Osamu, Echigo, S., Kohama, M., Suzuki, A.T., Inagaki, T., Nishikawa, K., Haines, T.J., Blaufuss, E., Kim, B.K., Sanford, R., Svoboda, R., Chen, M.L., Goodman, J.A., Sullivan, G.W., Hill, J., Jung, C.K., Martens, K., Mauger, C., McGrew, C., Sharkey, E., Viren, B., Yanagisawa, C., Doki, W., Kirisawa, M., Inaba, S., Miyano, K., Okazawa, H., Saji, C., Takahashi, M., Takahata, M., Higuchi, K., Nagashima, Y., Takita, M., Yamaguchi, T., Yoshida, M., Kim, S.B., Etoh, M., Hasegawa, A., Hasegawa, T., Hatakeyama, S., Inoue, K., Iwamoto, T., Koga, M., Maruyama, T., Ogawa, H., Shirai, J., Suzuki, A., Tsushima, F., Koshiba, M., Hatakeyama, Y., Koike, M., Nemoto, M., Nishijima, K., Fujiyasu, H., Futagami, T., Hayato, Y., Kanaya, Y., Kaneyuki, K., Watanabe, Y., Kielczewska, D., George, J.S., Stachyra, A.L., Wilkes, R.J., Young, K.K.

Phys.Lett.B　467　185-193　1999年

DOI： 10.1016/S0370-2693(99)01188-0 　
Measurement of the flux and zenith-angle distribution of upward through-going muons in Kamiokande II+III 査読有り

S Hatakeyama, T Hara, Y Fukuda, T Hayakawa, K Inoue, K Ishihara, H Ishino, S Joukou, T Kajita, S Kasuga, Y Koshio, T Kumita, K Matsumoto, M Nakahata, K Nakamura, K Okumura, A Sakai, M Shiozawa, J Suzuki, Y Suzuki, T Tomoeda, Y Totsuka, KS Hirata, K Kihara, Y Oyama, M Koshiba, K Nishijima, T Horiuchi, K Fujita, M Koga, T Maruyama, A Suzuki, M Mori, T Suda, AT Suzuki, T Ishizuka, K Miyano, H Okazawa, Y Nagashima, M Takita, T Yamaguchi, Y Hayato, K Kaneyuki, T Suzuki, Y Takeuchi, T Tanimori, S Tasaka, E Ichihara, S Miyamoto, K Nishikawa

PHYSICAL REVIEW LETTERS　81　(10)　2016-2019　1998年9月
出版者・発行元：AMERICAN PHYSICAL SOC
DOI： 10.1103/PhysRevLett.81.2016 　

ISSN：0031-9007

詳細を見る詳細を閉じる

The flux of upward through-going muons of minimum (mean) threshold energy >1.6 (3.0) GeV is measured, based on a total of 372 events observed by the Kamiokande II + III detector during 2456 detector live days. The observed muon flux was Phi(obs) = [1.94 +/- 0.10(stat.)(-0.06)(+0.07)sys.)] x 10(-13) cm(-2)s(-1) sr(-1), which is compared to an expected value of Phi(theo) = [2.46 +/- 0.54(theo.)] x 10(-13) cm(-2)s(-1) sr(-1). The observation is in agreement with the prediction within the errors. The zenith-angle dependence of the observed upward through-going muons supports the previous indication of neutrino oscillations made by Kamiokande using sub- and multi-GeV atmospheric neutrino events.
Evidence for oscillation of atmospheric neutrinos 査読有り

Fukuda, Y., Hayakawa, T., Ichihara, E., Inoue, K., Ishihara, K., Ishino, H., Itow, Y., Kajita, T., Kameda, J., Kasuga, S., Kobayashi, K., Kobayashi, Y., Koshio, Y., Miura, M., Nakahata, M., Nakayama, S., Okada, A., Okumura, K., Sakurai, N., Shiozawa, M., Suzuki, Y., Takeuchi, Y., Totsuka, Y., Yamada, S., Earl, M., Habig, Alec, Kearns, E., Messier, M.D., Scholberg, K., Stone, J.L., Sulak, L.R., Walter, C.W., Goldhaber, M., Barszczak, T., Casper, D., Gajewski, W., Halverson, P.G., Hsu, J., Kropp, W.R., Price, L.R., Reines, F., Smy, M., Sobel, H.W., Vagins, M.R., Ganezer, K.S., Keig, W.E., Ellsworth, R.W., Tasaka, S., Flanagan, J.W., Kibayashi, A., Learned, J.G., Matsuno, S., Stenger, V.J., Takemori, D., Ishii, T., Kanzaki, J., Kobayashi, T., Mine, S., Nakamura, K., Nishikawa, K., Oyama, Y., Sakai, A., Sakuda, M., Sasaki, Osamu, Echigo, S., Kohama, M., Suzuki, A.T., Haines, T.J., Blaufuss, E., Kim, B.K., Sanford, R., Svoboda, R., Chen, M.L., Conner, Z., Goodman, J.A., Sullivan, G.W., Hill, J., Jung, C.K., Martens, K., Mauger, C., McGrew, C., Sharkey, E., Viren, B., Yanagisawa, C., Doki, W., Miyano, K., Okazawa, H., Saji, C., Takahata, M., Nagashima, Y., Takita, M., Yamaguchi, T., Yoshida, M., Kim, S.B., Etoh, M., Fujita, K., Hasegawa, A., Hasegawa, T., Hatakeyama, S., Iwamoto, T., Koga, M., Maruyama, T., Ogawa, H., Shirai, J., Suzuki, A., Tsushima, F., Koshiba, M., Nemoto, M., Nishijima, K., Futagami, T., Hayato, Y., Kanaya, Y., Kaneyuki, K., Watanabe, Y., Kielczewska, D., Doyle, R.A., George, J.S., Stachyra, A.L., Wai, L.L., Wilkes, R.J., Young, K.K.

Phys.Rev.Lett.　81　(8)　1562-1567　1998年

DOI： 10.1103/PhysRevLett.81.1562 　
A study on the e/μ identification capability of a water Cerenkov detector and the atmospheric neutrino problem 査読有り

S. Kasuga, T. Hayakawa, S. Joukou, T. Kajita, Y. Koshio, T. Kumita, K. Matsumoto, M. Nakahata, A. Sakai, M. Shiozawa, Y. Suzuki, Y. Totsuka, K. S. Hirata, K. Kihara, Y. Oyama, O. Sasaki, A. T. Suzuki, T. Ishizuka, K. Miyano, H. Okazawa, K. Nishikawa, K. Fujita, M. Koga, A. Suzuki

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics　374　(1-3)　238-242　1996年5月2日
出版者・発行元：Elsevier
DOI： 10.1016/0370-2693(96)00138-4 　

ISSN：0370-2693

詳細を見る詳細を閉じる

We carried out an experimental test of various characteristics of a water Čerenkov detector, especially the particle identification capability, using the 12-GeV proton synchrotron at KEK, Japan. The detector characteristics so far studied are well reproduced by the Monte Carlo simulation. Especially it is able to identify electrons and muons with mis-identification probabilities less than a few percent in the momentum range of 250-1000 MeV/c except the particle positions in the extreme edge of the detector volume. Based on the present results, the deficiency of μ-neutrinos in the atmospheric neutrinos is not an artifact caused by some peculiar detector characteristics.
Search for neutralino dark matter heavier than theWboson at Kamiokande

M. Mori, M. M. Nojiri, K. S. Hirata, K. Kihara, Y. Oyama, A. Suzuki, K. Takahashi, M. Yamada, H. Takei, M. Koga, K. Miyano, H. Miyata, Y. Fukuda, T. Hayakawa, K. Inoue, T. Ishida, T. Kajita, Y. Koshio, M. Nakahata, K. Nakamura, A. Sakai, N. Sato, M. Shiozawa, J. Suzuki, Y. Suzuki, Y. Totsuka, M. Koshiba, K. Nishijima, T. Kajimura, T. Suda, A. T. Suzuki, T. Hara, Y. Nagashima, M. Takita, H. Yokoyama, A. Yoshimoto, K. Kaneyuki, Y. Takeuchi, T. Tanimori, S. Tasaka, K. Nishikawa

Physical Review D　48　(12)　5505-5518　1993年12月15日
出版者・発行元：American Physical Society (APS)
DOI： 10.1103/physrevd.48.5505 　

ISSN：0556-2821

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MISC 11

高純度ヨウ化ナトリウムの結晶育成

伏見賢一, Chernyak D., 江尻宏泰, 畑和実, 硲隆太, 飯田崇史, 池田晴雄, 今川恭四郎, 井上邦雄, 井上邦雄, 伊藤博士, 岸本忠史, 古賀真之, 古賀真之, 小寺健太, Kozlov A., 中村健悟, 中村健悟, 折戸玲子, 嶋達志, 竹本康浩, 竹本康浩, 梅原さおり, 浦野雄介, 山本祐平, 保田賢輔, 吉田斉

日本結晶成長学会誌(CD-ROM)　49　(4)　2023年

ISSN：2188-7268
超高純度無機シンチレーターによる宇宙・素粒子稀現象の研究

伏見賢一, 小寺健太, 折戸玲子, 浦野雄介, CHERNYAK Dmitry, 江尻宏泰, 岸本忠史, 嶋達志, 梅原さおり, 吉田斉, 畑和実, 池田晴雄, 井上邦雄, 古賀真之, 黒澤俊介, 硲隆太, 飯田崇史, 今川恭四郎, 保田賢輔, 伊藤博士, KOZLOV Alexandre, 中村健悟, 竹本康浩

日本セラミックス協会秋季シンポジウム講演予稿集(Web)　35th　2022年
高純度NaI(Tl)検出器のバックグラウンド測定 2

小寺健太, 伏見賢一, CHERNYAK D., 江尻宏泰, 畑和実, 硲隆太, 飯田崇史, 池田晴雄, 今川恭四郎, 井上邦雄, 石浦宏尚, 伊藤博士, 岸本忠史, 古賀真之, KOZLOV A., 中村健悟, 中村健悟, 折戸玲子, 嶋達志, 竹本康浩, 竹本康浩, 梅原さおり, 浦野雄介, 保田賢輔, 吉田斉

日本物理学会講演概要集(CD-ROM)　77　(2)　2022年

ISSN：2189-079X
Hyper-Kamiokande Design Report

Hyper-Kamiokande Proto-Collaboration, K. Abe

arXiv.org　(1805.04163)　2018年11月
Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen (vol 117, 082503, 2016)

A. Gando, Y. Gando, T. Hachiya, A. Hayashi, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Karino, M. Koga, S. Matsuda, T. Mitsui, K. Nakamura, S. Obara, T. Oura, H. Ozaki, I. Shimizu, Y. Shirahata, J. Shirai, A. Suzuki, T. Takai, K. Tamae, Y. Teraoka, K. Ueshima, H. Watanabe, A. Kozlov, Y. Takemoto, S. Yoshida, K. Fushimi, T. I. Banks, B. E. Berger, B. K. Fujikawa, T. O'Donnell, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

PHYSICAL REVIEW LETTERS　117　(10)　2016年9月
出版者・発行元：AMER PHYSICAL SOC
DOI： 10.1103/PhysRevLett.117.109903 　

ISSN：0031-9007

eISSN：1079-7114
White paper: CeLAND - Investigation of the reactor antineutrino anomaly with an intense 144Ce-144Pr antineutrino source in KamLAND

A. Gando

arXiv.org　(1309.6805)　2013年9月

詳細を見る詳細を閉じる

We propose to test for short baseline neutrino oscillations, implied by the recent reevaluation of the reactor antineutrino flux and by anomalous results from the gallium solar neutrino detectors. The test will consist of producing a 75 kCi 144Ce - 144Pr antineutrino source to be deployed in the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND). KamLAND's 13m diameter target volume provides a suitable environment to measure energy and position dependence of the detected neutrino flux. A characteristic oscillation pattern would be visible for a baseline of about 10 m or less, providing a very clean signal of neutrino disappearance into a yet-unknown, "sterile" state. Such a measurement will be free of any reactor-related uncertainties. After 1.5 years of data taking the Reactor Antineutrino Anomaly parameter space will be tested at > 95% C.L.
High Sensitivity Search for ν̄<inf>e</inf>'s from the Sun and Other Sources at KamLAND

K. Eguchi, S. Enomoto, K. Furuno, H. Ikeda, K. Ikeda, K. Inoue, K. Ishihara, Iwamoto, T. Kawashima, Y. Kishimoto, M. Koga, Y. Koseki, T. Maeda, T. Mitsui, M. Motoki, K. Nakajima, H. Ogawa, K. Owada, F. Piquemal, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, K. Tada, O. Tajima, T. Takayama, K. Tamae, H. Watanabe, J. Busenitz, Z. Djurcic, K. McKinny, D. M. Mei, A. Piepke, E. Yakushev, B. E. Berger, Y. D. Chan, M. P. Decowski, D. A. Dwyer, S. J. Freedman, Y. Fu, B. K. Fujikawa, J. Goldman, K. M. Heeger, K. T. Lesko, K. B. Luk, H. Murayama, D. R. Nygren, C. E. Okada, A. W.P. Poon, H. M. Steiner, L. A. Winslow, G. A. Horton-Smith, C. Mauger, R. D. McKeown, B. Tipton, P. Vogel, C. E. Lane, T. Miletic, P. W. Gorham, G. Guillian, J. G. Learned, J. Maricic, S. Matsuno, S. Pakvasa, S. Dazeley, S. Hatakeyama, R. Svoboda, B. D. Dieterle, M. DiMauro, J. Detwiler, G. Gratta, K. Ishii, N. Tolich, Y. Uchida, M. Batygov, W. Bugg, Y. Efremenko, Y. Kamyshkov, A. Kozlov, Y. Nakamura, C. R. Gould, H. J. Karwowski, D. M. Markoff, J. A. Messimore, K. Nakamura, R. M. Rohm, W. Tornow, A. R. Young, M. J. Chen, Y. F. Wang

Physical Review Letters　92　713011-713015　2004年2月20日

ISSN：0031-9007

詳細を見る詳細を閉じる

The data corresponding to a KamLAND detector exposure of 0.28 kton yr, that has been used to search for v̄e's was analyzed. It was assumed that all v̄e flux had its origin in the Sun and had the characteristics 8B solar v8 energy spectrum. An upper limit of 3.7 ×102 cm-1s-1 on the v̄e flux was obtained. The limit on the product of the neutrino transition magnetic moment μ and the transverse component of the magnetic field BT in the Sun at a radius of 0.05Rs was also obtained.
Recent status of the KamLAND experiment

F. Suekane, K. Eguchi, S. Enomoto, K. Furuno, Y. Gando, J. Goldman, H. Hanada, H. Ikeda, K. Ikeda, K. Inoue, K. Ishihara, T. Iwamoto, T. Kawashima, Y. Kishimoto, M. Koga, Y. Koseki, T. Maeda, T. Mitsui, M. Motoki, K. Nakajima, M. Nakajima, T. Nakajima, H. Ogawa, K. Oki, K. Owada, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, K. Tada, O. Tajima, T. Takayama, K. Tamae, H. Watanabe, T. Taniguchi, Y. F. Wang, J. Busenitz, Z. Djurcic, K. McKinny, D. M. Mei, A. Piepke, E. Yakushev, B. Berger, R. N. Cahn, Y. D. Chan, X. Chen, S. J. Freedman, B. K. Fujikawa, K. T. Lesko, K. B. Luk, H. Murayama, D. R. Nygren, C. E. Okada, A. W. Poon, H. M. Steiner, L. Hannelius, G. A. Horton-Smith, R. D. McKeown, J. Ritter, B. Tipton, P. Vogel, C. E. Lane, P. Gorham, J. Learned, J. Maricic, S. Matsuno, S. Pakvasa, S. Dazeley, S. Hatakeyama, R. C. Svoboda, B. D. Dieterle, C. Gregory, J. Detwiler, G. Gratta, H. L. Liew, D. Murphree, N. Tolich, Y. Uchida, M. Batygov, S. Berridge, W. Bugg, H. Cohn, Y. Efremenko, Y. Kamyshkov, Y. Nakamura, L. DeBraeckeleer, C. Gould, H. Karwowski, D. Markoff, J. Messimore, K. Nakamura, R. Rohm, W. Tornow, A. Young

Nuclear Physics B - Proceedings Supplements　112　128-132　2002年11月1日

ISSN：0920-5632

詳細を見る詳細を閉じる

The KamLAND experiment is a very long baseline reactor ̄ne oscillation experiment. This experiment has sensitivity to the oscillation parameters Δℳ2 > 10-5 eV2 and sin2θ > 0.2, using reactor ̄ne which come typically from 170km away. This sensitive region completely covers the currently most favored MSW-LMA solution for the solar neutrino deficit problem. After 5 years of detector construction, the data taking started successfully in Jan. 2002. The detector performance is sufficient to perform reactor ̄ne physics and we expect the first physics result will come out soon. In this paper, the KamLAND detector, its expected sensitivities, history, and recent progress since the time of the conference, are briefly described.
巨大実験装置での放射線検出器の開発ニュートリノの謎に迫る1000トン液体シンチレーター検出器

古賀真之

放射線　25　(4)　17-24　1999年10月
出版者・発行元：応用物理学会,放射線分科会
ISSN：0285-3604
ニュートリノの謎に迫る1000トン液体シンチレーター検出器の建設

古賀真之

応用物理学関係連合講演会講演予稿集　46th　(0)　41　1999年3月28日
Large-scale anisotropy of the cosmic-ray muon flux in Kamiokande

K Munakata, T Kiuchi, S Yasue, C Kato, S Mori, KS Hirata, K Kihara, Y Oyama, M Mori, K Fujita, S Hatakeyama, M Koga, T Maruyama, A Suzuki, T Ishizuka, K Miyano, H Okazawa, Y Fukuda, T Hayakawa, K Inoue, K Ishihara, H Ishino, S Joukou, T Kajita, S Kasuga, Y Koshio, T Kumita, K Matsumoto, M Nakahata, K Nakamura, K Okumura, A Sakai, M Shiozawa, J Suzuki, Y Suzuki, T Tomoeda, Y Totsuka, T Horiuchi, K Nishijima, M Koshiba, T Suda, AT Suzuki, T Hara, Y Nagashima, M Takita, T Yamaguchi, Y Hayato, K Kaneyuki, T Suzuki, Y Takeuchi, T Tanimori, S Tasaka, E Ichihara, S Miyamoto, K Nishikawa

PHYSICAL REVIEW D　56　(1)　23-26　1997年7月
出版者・発行元：AMERICAN PHYSICAL SOC
DOI： 10.1103/PhysRevD.56.23 　

ISSN：0556-2821

詳細を見る詳細を閉じる

The large-scale anisotropy of cosmic-ray primaries in the celestial coordinate was studied using cosmic-ray muons recorded in a large water Cherenkov detector, Kamiokande. The right-ascension distribution of the muon arrival directions deviated from an isotropic distribution with a 2.8 standard deviation, and agreed well with the first harmonics with an amplitude of (5.6 +/- 1.9) x 10(-4) and a phase of 8.0 degrees +/- 19.1 degrees. This is the deepest underground observation of the large-scale anisotropy of cosmic rays, and agrees with observations with other underground experiments and extensive air-shower array experiments.

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講演・口頭発表等 10

KamLAND-Zen 800 status and future prospects 国際会議招待有り

古賀真之

ICNFP2017　2017年8月22日
KamLAND-Zen 国際会議招待有り

古賀真之

2017 Tamura symposium　2017年5月8日
KamLAND-Zen double beta decay experiment

Windows on the Universe　2013年8月12日
KamLAND-Zen double beta decay experiment

International Symposium on Neutrino Physics and Beyond　2012年9月23日
KamLAND experience 国際会議

Advances in Neutrino Technology　2011年10月10日
KamLAND double beta experiment using 136Xe 国際会議

ICHEP2010　2010年7月22日
The future project of KamLAND 国際会議

Workshop on Xenon-Based Detectors　2009年11月16日
Rn-reduced air - electrostatic 国際会議

Low Radioactivity Techniques 2004　2004年12月12日
Evidence for Reactor Anti-Neutrino Disappearance on KamLAND 国際会議

2003 International Symposium on Cosmology and Particle Astrophysics　2003年11月13日
Detection of reactor and solar neutrinos in KamLAND 国際会議

The 2nd International Conference on Flavor Physics　2003年10月6日

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共同研究・競争的資金等の研究課題 7

136Xeを用いたニュートリノレス二重ベータ崩壊事象の探索競争的資金

制度名：Ordinary Research

2009年4月～継続中
KamLAND実験におけるニュートリノ欠損問題の解明競争的資金

1998年4月～継続中
高発光液体シンチレータ検出器によるマヨラナニュートリノ質量の研究

清水格, 古賀真之, 池田晴雄, 丸藤亜寿紗

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research

研究種目：Grant-in-Aid for Scientific Research (B)

研究機関：Tohoku University

2015年4月1日～ 2018年3月31日

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ニュートリノが持つマヨラナ質量を高感度測定するための液体シンチレータ検出器開発を行った。その結果、液体シンチレータ原料に含まれる吸光不純物に対して、モレキュラーシーブや活性炭による吸着純化が有効であり、シンチレータとしての性能が大きく向上することが判明した。純化によって発光量と光透過率が増加したことで、目標としていた検出器の高性能化を達成した。本研究によって大型検出器製作にかかるコストが大幅に抑えられたことから、液体シンチレータ検出器によってマヨラナ質量の観測が実現する可能性が高まった。
原子炉起源, 地球起源反電子ニュートリノと太陽起源電子ニュートリノの高精度精密測定

鈴木厚人, 井上邦雄, 白井淳平, 古賀真之, 三井唯夫, 岸本康宏, 井上邦雄, 白井淳平, 古賀真之, 三井唯夫, 岸本康宏, 末包文彦

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research

研究種目：Grant-in-Aid for Specially Promoted Research

研究機関：Tohoku University

2004年～ 2008年

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原子炉起源反電子ニュートリノが飛行中に減少・復元を繰り返すニュートリノ振動を2周期にわたって観測し、ニュートリノ振動パラメータの精密測定に成功した。また、地球内部起源反電子ニュートリノの観測に成功しニュートリノ地球科学を創出するとともに、高精度化により地球モデルの現実的な検証が可能となった。さらに低エネルギーの太陽起源ニュートリノ観測に必要な、液体シンチレータの高度純化およびデッドタイムフリー電子回路の開発に成功した。
KamLANDにおける7Be太陽ニュートリノ検出の為の極低濃度放射性不純物除去システムの開発研究競争的資金

制度名：Grant-in-Aid for Scientific Research

2005年4月～ 2007年3月
大型液体シンチレーター実験装置における放射線バックグラウンド事象の研究

古賀真之

2002年～ 2003年

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昨年度に大型液体シンチレーター検出器であるカムランド実験装置本体でのバックグラウンド事象の研究を行い、当初に遅延同時計数を用いた原子炉反電子ニユートリノの検出における主なバッググラウンドとなると予想された^<238>Uの存在量は(3.5+-0.5)×10^<-18>g/g、^<232>Thの場合は(5.2+-0.8)×10^<-17>g/gと無視できる量であることが求められた。本年度は、次の目標である^7Be太陽ニュートリノの検出では単事象でのバックグラウンドも考慮しなげればならないことから、その起源となるおそれのある気中および液体シンチレーター中に存在するRnの量を測定するための検出器の研究を行った。開発する検出器は静電捕集型であり、その容器は検出器内で発生するRnの量を低減させるために内面に高グレードの電解研磨処理を施してある。検出部はパッシベーション処理を施したPINフォトダイオード、腐食とノイズ低減を目的としたセラミック製フィードスルー、アンプモジュールからなっている。静電捕集法では陽イオン化しているRnの娘核種(^<218>Po,^<214>Bi)をフォトダイオード周辺に収集し崩壊によって生じるα線を計測することから、予め最適な電場が作れる様にシミュレーシヨンにより容器の形状と接地のとり方、及び電圧値の関係を求めた。現在は、検出器の製作と放射線源を用いての装置の較正が完了しており、試験的に空気中のラドン濃度の計測を行っているとこるである。今後はどの程度の低濃度までRn検出が可能であるかを評価した上で、検出器の改良に取り組んでいく予定である。具体的には、検出器内で発生するRnの更なる低減化、冷却捕獲によるRn濃縮方法の確立、有機液体への応用を進める。
極低放射能環境下におけるニュートリノ科学の研究

鈴木厚人, 井上邦雄, 末包文彦, 白井淳平, 古賀真之, 斎官清四郎, 山口晃, 阿部浩也, 吉村太彦, 橋本治

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research

研究種目：Grant-in-Aid for COE Research

研究機関：Tohoku University

1997年～ 2003年

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研究代表者が率いるカムランド実験は,中核的研究拠点形成プログラムの支援(平成9年度〜平成15年度)を得て,平成13年度に1000トン液体シンチレータニュートリノ/反ニュートリノ観測装置を神岡鉱山の地下に完成させた。そして,平成14年1月よりデータ収集を開始し,現在継続中である。この間,平成14年12月に,原子力発電所の原子炉から生成される反電子ニュートリノ(原子炉起源)の消失現象を世界で初めて検出した。この現象は,ニュートリノが質量を持つことに起因するニュートリノ振動を強く示唆し,その証拠は次の論文(平成16年7月予定)で公表する予定である。また,原子炉反電子ニュートリノ消失現象の発見に関する論文(Phys.Rev.Lett.90,021802,2003)は,現在までに被引用数537となっており、Thomson ISI Web of Scienceデータに基づくScience Watch誌の最新号(March/April,2004)では本論文は月間被引用数で物理学分野の世界第1位、医学、化学、生命科学・物理学を合わせた総合順位でも世界第2位となっている。本研究では,反電子ニュートリノスペクトルにおけるウラン及びトリウム・ピークの同定による地球反ニュートリノ検出の挑戦も行なわれた。これまでの実験で検出器の充分な性能が示され、世界初の検出が期待されている。実現すれば地球内部のウランやトリウムの存在量、ウラン/トリウム比の測定など地球内部のエネルギー生成機構や地球進化史の解明に不可欠の情報が期待される。また検出器を更に高感度化し^7Be太陽ニュートリノの未曾有の高感度測定を目指した研究が進行中である。

︎全件表示 ︎最初の5件までを表示

社会貢献活動 66

奈良県立青翔中学

2016年11月9日～ 2016年11月10日

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カムランド施設見学対応と事前講義。
大阪府立生野高校

2016年9月12日～ 2016年9月13日

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カムランド施設見学対応と事前講義。
新潟市立万代高校

2016年8月17日～ 2016年8月18日

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カムランド施設見学対応と事前講義。
大阪星光学院高校

2016年8月8日～ 2016年8月9日

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カムランド施設見学対応と事前講義。
新潟県立高田高校

2016年8月3日～ 2016年8月4日

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カムランド施設見学対応と事前講義。
慶應義塾湘南藤沢高校

2016年7月19日～ 2016年7月20日

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カムランド施設見学対応と事前講義。
SSH新潟県立高田高校

2014年8月19日～ 2014年8月20日

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カムランド施設見学対応。
SSH埼玉県立熊谷高校

2014年7月31日～ 2014年8月1日

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SSH京都府立桃山高校

2014年7月29日～ 2014年7月30日

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SSH大阪府立千里高校

2013年10月10日～ 2013年10月11日

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SSH京都市立堀川高校

2013年10月9日～ 2013年10月10日

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SSH山梨英和高校

2013年8月19日～ 2013年8月20日

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SSH京都府立桃山高校

2013年7月29日～ 2013年7月30日

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カムランド施設見学対応と事前講義。
SSH大阪府立生野高校

2012年8月20日～ 2012年8月21日

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カムランド施設見学対応と事前講義。
新潟大学主催サイエンススクール

2012年3月28日～ 2012年3月29日

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カムランド施設見学対応と事前講義。
SSH大阪府立生野高校

2011年8月17日～ 2011年8月18日

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カムランド施設見学対応と事前講義。
SSH大阪府立泉北高校研修

2007年8月20日～ 2007年8月21日

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カムランド施設見学対応と事前講義90分間
SSH滋賀県立膳所高校研修

2007年7月23日～ 2007年7月24日

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カムランド施設見学対応と事前講義90分間
愛知県立刈谷高校

2016年8月30日～

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カムランド施設見学対応と事前講義。
御茶ノ水女子大付属高校

2016年8月25日～

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京都教育大附属高校

2016年8月23日～

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山梨県立日川高校

2016年8月22日～

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カムランド施設見学対応。
「夢のたまご塾」飛騨アカデミー２０16夏セミナー

2016年8月5日～

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カムランド施設見学の案内
宮城教育大学ひらめき☆ときめきサイエンス

2016年8月3日～

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宮城教育大学ひらめき☆ときめきサイエンスに協力して、インターネットを利用した、カムランド見学ツアー。カメラを通して実験室内を案内する。
栃木県立足利高校

2016年8月2日～

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京都府立桃山高校

2016年7月28日～

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石川県立七尾高校

2016年7月27日～

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山梨県立甲府南高校

2016年7月25日～

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カムランド施設見学対応。
富山県立富山高校

2016年7月21日～

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カムランド施設見学対応と事前講義。
静岡理工科大学静岡北高校

2016年4月21日～

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カムランド施設見学対応と事前講義。
SSH山梨県立甲府南高校

2014年8月22日～

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カムランド施設見学対応。
SSH京都教育大付属高校

2014年8月20日～

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カムランド施設見学対応と事前講義。
「夢のたまご塾」飛騨アカデミー２０13夏セミナー

2014年8月8日～

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カムランド施設見学の案内
SSH岐阜県立恵那高校

2014年8月7日～

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カムランド施設見学対応。
SSH栃木県立足利高校

2014年8月5日～

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カムランド施設見学対応と事前講義。
SSH 山梨県立日川高校

2014年7月28日～

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カムランド施設見学対応。
GSAサイエンスセミナー

2014年7月19日～

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一般向けセミナー。講演タイトル「ニュートリノで地球を観る」。
SSH静岡理工科大学静岡北高校

2014年4月25日～

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SSH山梨県立甲府南高校

2013年8月22日～

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カムランド施設見学対応。
SSH京都教育大付属高校

2013年8月21日～

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2013年8月9日～

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SSH岐阜県立恵那高校

2013年8月8日～

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SSH福井県立藤島高校

2013年8月7日～

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SSH愛知県立刈谷高校

2013年7月30日～

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2013年7月25日～

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SSH静岡理工科大学静岡北高校

2013年4月25日～

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SSH栃木県立足利高校

2012年8月27日～

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SSH京都教育大付属高校

2012年8月22日～

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2012年8月17日～

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カムランド施設見学対応。
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2012年8月8日～

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カムランド施設見学対応。
SSH愛知県立刈谷高校

2012年8月7日～

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SSH福井県立藤島高校

2012年8月6日～

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2012年8月3日～

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SSH大分県立上野丘高校

2012年8月1日～

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SSH静岡理工科大学静岡北高校

2012年4月26日～

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SSH京都教育大附属高校

2011年8月23日～

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SSH山梨県立甲府南高校

2011年8月19日～

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カムランド施設見学対応と事前講義。
SSH愛知県立岡崎高校

2011年8月9日～

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「夢のたまご塾」飛騨アカデミー２０11夏セミナー

2011年8月5日～

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カムランド施設見学の案内
SSH新潟県立新潟南高校

2011年8月4日～

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カムランド施設見学対応と事前講義。
SSH新潟県立柏崎高校

2011年8月2日～

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カムランド施設見学対応と事前講義。
SSH静岡理工科大学静岡北高校

2011年4月21日～

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カムランド施設見学対応と事前講義。
飛騨アカデミー夢のたまご

2009年8月7日～

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国内各地から集まった高校生を対象に「地球ニュートリノとカムランド」について講義を行う。
中学生サイエンスキャンプ

2008年8月11日～

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岐阜県内の中学生を対象に「ニュートリノ振動」および「地球ニュートリノ」について講義を行う。
「夢のたまご塾」飛騨アカデミー２００７夏セミナー

2007年8月10日～

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「地球物理学とカムランド」のタイトルで90分の講義、及びカムランド施設見学の案内
「中学生のためのサイエンスキャンプ」岐阜県先端科学技術体験センターサイエンスワールド主催

2006年8月3日～

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「カムランドの紹介」のタイトルで90分の講義、及びカムランド施設見学の案内

︎全件表示 ︎最初の5件までを表示

メディア報道 3

別冊アサ秘ジャーナル

TBS

2014年12月21日

メディア報道種別: テレビ・ラジオ番組

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東北大学特集に関連して、神岡実験施設の説明を行った。
放送大学科目「宇宙とその進化」

放送大学

2014年4月17日

メディア報道種別: テレビ・ラジオ番組

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放送大学科目「宇宙とその進化」の第３回「電磁波以外の手段による宇宙の観測」でカムランド実験を取り上げていただき、実験装置について説明を行った。
優良事業所紹介

岐阜県危険物安全会報

2007年7月31日

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理学研究科附属ニュートリノ科学研究センターカムランド実験施設が優良事業所表彰を受けたことに伴う機関紙への紹介記事提供。主としてカムランド実験施設の紹介。