Results from KamLAND-Zen

Ken Asakura,A Gando,Y Gando,T Hachiya, S Hayashida, H Ikeda,K Inoue,K Ishidoshiro, Takaaki Ishikawa, S Ishio,M Koga,Rieko Matsuda,S Matsuda,Takeki Mitsui, D Motoki, Katsumasa Nakamura,Satoshi Obara,Yuji Oki,M Otani, Takashi Oura,Ippei Shimizu, Y Shirahata,J Shirai,Ayako Suzuki, Hiroki Tachibana,K Tamae, K Ueshima,Hirofumi Watanabe,B D Xu, Yoshikane Yamauchi, Haruyuki Yoshida,A Kozlov,Y Takemoto,Satoshi Yoshida,Kiyohide Fushimi,Tom Banks, S J Freedman,B K Fujikawa,T O Donnell,L A Winslow,B E Berger,Y V Efremenko,H J Karwowski,D M Markoff, W Tornow,J A Detwiler,S Enomoto,M P Decowski

AIP Conference Proceedings（2015）

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摘要

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.

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关键词

Double beta decay,Majorana neutrino mass

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