Measurement of the double-βdecay half-life of136Xe with the KamLAND-Zen experiment

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（2012）

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摘要

We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of 136Xe. The measured two-neutrino double-beta decay half-life of 136Xe is T1/22ν=2.38±0.02(stat)±0.14(syst)×1021 yr, consistent with a recent measurement by EXO-200. We also obtain a lower limit for the neutrinoless double-beta decay half-life, T1/20ν>5.7×1024 yr at 90% confidence level (C. L.), which corresponds to almost a fivefold improvement over previous limits.

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