S
S. Obara
Researcher at Tohoku University
Publications - 40
Citations - 1626
S. Obara is an academic researcher from Tohoku University. The author has contributed to research in topics: Neutrino & Scintillator. The author has an hindex of 9, co-authored 28 publications receiving 1292 citations. Previous affiliations of S. Obara include Kyoto University.
Papers
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Journal ArticleDOI
Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen.
A. Gando,Y. Gando,T. Hachiya,A. Hayashi,S. Hayashida,H. Ikeda,Kunio Inoue,Koji 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,Hideki Watanabe,A. Kozlov,Y. Takemoto,S. Yoshida,Ken-Ichi Fushimi,T. I. Banks,B. E. Berger,B. K. Fujikawa,T. O'Donnell,Lindley Winslow,Yuri Efremenko,Hugon J Karwowski,D. M. Markoff,Werner Tornow,J. A. Detwiler,Sanshiro Enomoto,M. P. Decowski +40 more
TL;DR: An improved search for neutrinoless double-beta (0νββ) decay of ^{136}Xe in the KamLAND-Zen experiment is presented and a significant reduction of the xenon-loaded liquid scintillator contaminant identified in previous searches is achieved.
Journal ArticleDOI
Publisher's Note: Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen [Phys. Rev. Lett. 117, 082503 (2016)].
A. Gando,Y. Gando,T. Hachiya,A. Hayashi,S. Hayashida,H. Ikeda,Kunio Inoue,Koji 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,Hideki Watanabe,A. Kozlov,Y. Takemoto,S. Yoshida,Ken-Ichi Fushimi,T. I. Banks,B. E. Berger,B. K. Fujikawa,T. O'Donnell,Lindley Winslow,Yu. Efremenko,Hugon J Karwowski,D. M. Markoff,Werner Tornow,J. A. Detwiler,Sanshiro Enomoto,M. P. Decowski +40 more
TL;DR: This corrects the article DOI: 10.1103/PhysRevLett.117.082503 to reflect that the paper was originally published in Physical Review Letters, not RevLett, rather than Science.
Journal ArticleDOI
Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen.
S Abe,Shigeo Asami,M. Eizuka,Sachiyo Futagi,A. Gando,Y. Gando,Takeharu Gima,A. Goto,T. Hachiya,Kazumi Hata,S. Hayashida,K. Hosokawa,Koichi Ichimura,S. Ieki,H. Ikeda,Kunio Inoue,Koji Ishidoshiro,Y Kamei,Noritaka Kawada,Yasuhiro Kishimoto,M. Koga,Masabumi Kurasawa,N. Maemura,T. Mitsui,Haruhiko Miyake,T. Nakahata,Ryosuke Nakamura,H. Ozaki,T Sakai,H. Sambonsugi,I. Shimizu,J. Shirai,K. K. Shiraishi,A. Suzuki,Y. Suzuki,Atsuto Takeuchi,K. Tamae,K. Ueshima,Y. Watanabe,Y. Yoshida,S. Obara,A. K. Ichikawa,D. M. Chernyak,A. Kozlov,K. Nakamura,S. Yoshida,Y. Takemoto,Saori Umehara,Ken-Ichi Fushimi,Keito Kotera,Yasunori Urano,B. E. Berger,B. K. Fujikawa,John G. Learned,J. Maricic,Spencer Axani,Joseph Smolsky,Z. Fu,Lindley Winslow,Yu. Efremenko,Hugon J Karwowski,D. M. Markoff,Werner Tornow,Stefano Dell'Oro,T. O'Donnell,J. A. Detwiler,Sanshiro Enomoto,M. P. Decowski,C. Grant,A. Li,H. Song +70 more
TL;DR: The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in this paper using a xenonloaded liquid scintillator.
Journal ArticleDOI
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
K. Asakura,A. Gando,Y. Gando,T. Hachiya,S. Hayashida,H. Ikeda,Kunio Inoue,Kunio Inoue,Koji Ishidoshiro,T. Ishikawa,S. Ishio,M. Koga,M. Koga,S. Matsuda,T. Mitsui,D. Motoki,K. Nakamura,K. Nakamura,S. Obara,M. Otani,T. Oura,I. Shimizu,Y. Shirahata,J. Shirai,A. Suzuki,H. Tachibana,K. Tamae,K. Ueshima,Hideki Watanabe,B. D. Xu,Hidetomo Yoshida,A. Kozlov,Y. Takemoto,S. Yoshida,Ken-Ichi Fushimi,T. I. Banks,B. E. Berger,B. E. Berger,B. K. Fujikawa,B. K. Fujikawa,T. O'Donnell,Lindley Winslow,Yu. Efremenko,Yu. Efremenko,Yu. Efremenko,H. J. Karwowski,D. M. Markoff,Werner Tornow,J. A. Detwiler,J. A. Detwiler,Sanshiro Enomoto,Sanshiro Enomoto,M. P. Decowski,M. P. Decowski +53 more
TL;DR: In this article, the first experimental lower half-life limits for the transitions to the 0 1 + state of 136Xe for 0 β β and 2 β β β decay were reported.
Journal ArticleDOI
KamLAND Sensitivity to Neutrinos from Pre-Supernova Stars
K. Asakura,A. Gando,Y. Gando,T. Hachiya,S. Hayashida,H. Ikeda,Kunio Inoue,Kunio Inoue,Koji Ishidoshiro,T. Ishikawa,S. Ishio,M. Koga,M. Koga,S. Matsuda,T. Mitsui,D. Motoki,K. Nakamura,K. Nakamura,S. Obara,T. Oura,I. Shimizu,Y. Shirahata,J. Shirai,A. Suzuki,H. Tachibana,K. Tamae,K. Ueshima,Hideki Watanabe,B. D. Xu,A. Kozlov,Y. Takemoto,Sei Yoshida,Ken-Ichi Fushimi,A. Piepke,A. Piepke,T. I. Banks,T. I. Banks,B. E. Berger,B. E. Berger,B. K. Fujikawa,B. K. Fujikawa,T. O'Donnell,T. O'Donnell,John G. Learned,J. Maricic,S. Matsuno,M. Sakai,Lindley Winslow,Yu. Efremenko,Yu. Efremenko,H. J. Karwowski,H. J. Karwowski,D. M. Markoff,D. M. Markoff,Werner Tornow,Werner Tornow,Werner Tornow,J. A. Detwiler,Sanshiro Enomoto,Sanshiro Enomoto,M. P. Decowski,M. P. Decowski +61 more
TL;DR: In this paper, Asakura et al. showed that the kiloton-scale liquid scintillator detector KamLAND can detect pre-supernova neutrinos from a star with a mass of 25 M ǫ at a distance less than 690 pc with 3σ significance before the supernova.