A
A. Oki
Researcher at Tohoku University
Publications - 9
Citations - 1142
A. Oki is an academic researcher from Tohoku University. The author has contributed to research in topics: Double beta decay & Neutrino oscillation. The author has an hindex of 5, co-authored 9 publications receiving 1049 citations.
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Journal ArticleDOI
Limit on neutrinoless ββ decay of Xe136 from the first phase of KamLAND-Zen and comparison with the positive claim in Ge76
A. Gando,Y. Gando,H. Hanakago,H. Ikeda,Kunio Inoue,Kunio Inoue,Koji Ishidoshiro,R. Kato,M. Koga,M. Koga,S. Matsuda,T. Mitsui,D. Motoki,T. Nakada,K. Nakamura,K. Nakamura,A. Obata,A. Oki,Y. Ono,M. Otani,I. Shimizu,J. Shirai,A. Suzuki,Y. Takemoto,K. Tamae,K. Ueshima,Hideki Watanabe,B. D. Xu,Sumio Yamada,Hidetomo Yoshida,A. Kozlov,S. Yoshida,T. I. Banks,T. I. Banks,Stuart J. Freedman,Stuart J. Freedman,Stuart J. Freedman,B. K. Fujikawa,B. K. Fujikawa,B. K. Fujikawa,Ke Han,Ke Han,T. O'Donnell,T. O'Donnell,B. E. Berger,Yu. Efremenko,Yu. Efremenko,Hugon J Karwowski,D. M. Markoff,Werner Tornow,J. A. Detwiler,Sanshiro Enomoto,Sanshiro Enomoto,M. P. Decowski,M. P. Decowski +54 more
TL;DR: The combined results from KamLAND-Zen and EXO-200 give T(1/2)(0ν)>3.4×10(25) yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of <(120-250) meV based on a representative range of available matrix element calculations.
Journal ArticleDOI
Reactor On-Off Antineutrino Measurement with KamLAND
A. Gando,Y. Gando,H. Hanakago,H. Ikeda,Kunio Inoue,Kunio Inoue,Koji Ishidoshiro,H. Ishikawa,M. Koga,M. Koga,R. Matsuda,S. Matsuda,T. Mitsui,D. Motoki,K. Nakamura,K. Nakamura,A. Obata,A. Oki,Y. Oki,M. Otani,I. Shimizu,J. Shirai,A. Suzuki,Y. Takemoto,K. Tamae,K. Ueshima,Hideki Watanabe,B. D. Xu,Sumio Yamada,Y. Yamauchi,Hidetomo Yoshida,A. Kozlov,S. Yoshida,A. Piepke,A. Piepke,T. I. Banks,T. I. Banks,B. K. Fujikawa,B. K. Fujikawa,B. K. Fujikawa,Ke Han,Ke Han,T. O'Donnell,T. O'Donnell,B. E. Berger,B. E. Berger,John G. Learned,S. Matsuno,M. Sakai,Yuri Efremenko,Yuri Efremenko,Hugon J Karwowski,D. M. Markoff,Werner Tornow,J. A. Detwiler,Sanshiro Enomoto,Sanshiro Enomoto,M. P. Decowski,M. P. Decowski +58 more
TL;DR: In this article, a combined three-flavor analysis of solar and KamLAND data gives fit values for the oscillation parameters of tan2θ12=0.436+0.029−0.025, Δm221=7.53 + 0.18 − 0.002, and sin2πθ13=
Journal ArticleDOI
Measurement of the double-β decay half-life of 136Xe with the KamLAND-Zen experiment
A. Gando,Y. Gando,H. Hanakago,H. Ikeda,Kunio Inoue,Kunio Inoue,R. Kato,M. Koga,M. Koga,S. Matsuda,T. Mitsui,T. Nakada,K. Nakamura,K. Nakamura,A. Obata,A. Oki,Y. Ono,I. Shimizu,J. Shirai,A. Suzuki,Y. Takemoto,K. Tamae,K. Ueshima,Hideki Watanabe,B. D. Xu,S. Yamada,Hidetomo Yoshida,A. Kozlov,S. Yoshida,T. I. Banks,J. A. Detwiler,Stuart J. Freedman,Stuart J. Freedman,B. K. Fujikawa,B. K. Fujikawa,Ke Han,T. O'Donnell,B. E. Berger,Yu. Efremenko,Yu. Efremenko,Hugon J Karwowski,D. M. Markoff,Werner Tornow,Sanshiro Enomoto,Sanshiro Enomoto,M. P. Decowski,M. P. Decowski +46 more
TL;DR: In this article, the KamLAND-Zen double-beta decay experiment was used to obtain a lower bound of T1/20ν>5.7×1024 yr at 90% confidence level (C. L.), which corresponds to a fivefold improvement over previous limits.
Journal ArticleDOI
Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment
A. Gando,Y. Gando,H. Hanakago,H. Ikeda,Kunio Inoue,Kunio Inoue,R. Kato,M. Koga,M. Koga,S. Matsuda,T. Mitsui,T. Nakada,K. Nakamura,K. Nakamura,A. Obata,A. Oki,Y. Ono,I. Shimizu,J. Shirai,A. Suzuki,Y. Takemoto,K. Tamae,K. Ueshima,Hideki Watanabe,B. D. Xu,S. Yamada,Hidetomo Yoshida,A. Kozlov,S. Yoshida,T. I. Banks,J. A. Detwiler,Stuart J. Freedman,Stuart J. Freedman,B. K. Fujikawa,B. K. Fujikawa,Ke Han,T. O'Donnell,B. E. Berger,Yu. Efremenko,Yu. Efremenko,H. J. Karwowski,D. M. Markoff,Werner Tornow,Sanshiro Enomoto,Sanshiro Enomoto,M. P. Decowski,M. P. Decowski +46 more
TL;DR: In this article, the authors presented limits on Majoron-emitting neutrinoless double-β decay modes based on an exposure of 112.3 days with 125 kg of 136Xe.
Journal ArticleDOI
7Be solar neutrino measurement with KamLAND
A. Gando,Y. Gando,H. Hanakago,H. Ikeda,Kunio Inoue,Koji Ishidoshiro,H. Ishikawa,Yasuhiro 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,Hideki Watanabe,B. D. Xu,S. Yamada,Y. Yamauchi,Hidetomo Yoshida,A. Kozlov,Y. Takemoto,S. Yoshida,C. Grant,G. Keefer,D. McKee,A. Piepke,T. I. Banks,T. Bloxham,S. J. Freedman,B. K. Fujikawa,Ke Han,Leon Hsu,Koichi Ichimura,Hitoshi Murayama,T. O'Donnell,H. M. Steiner,Lindley Winslow,D. A. Dwyer,C. Mauger,R. D. McKeown,Chao 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,Yu. Efremenko,Yuri Kamyshkov,O. Perevozchikov,Hugon J Karwowski,D. M. Markoff,Werner Tornow,J. A. Detwiler,Sanshiro Enomoto,K. M. Heeger,M. P. Decowski +70 more
TL;DR: The neutrino-electron elastic scattering rate of 862 keV Be7 solar neutrinos based on a 165.4 kt d exposure of KamLAND was measured in this article.