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Measurement of the double- β decay half-life of 136 Xe with the KamLAND-Zen experiment

2012; American Institute of Physics; Volume: 85; Issue: 4 Linguagem: Inglês

10.1103/physrevc.85.045504

1538-4497

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, Ryoko Kato, M. Koga, Sumio Matsuda, T. Mitsui, T. Nakada, K. Nakamura, A. Obata, A. Oki, Yukari Ono, I. Shimizu, J. Shirai, A. Suzuki, Y. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, H. P. Yoshida, A. Kozlov, S. Yoshida, T. Banks, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, T. O׳Donnell, B. E. Berger, Y. V. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Enomoto, M. P. Decowski,

Nuclear physics research studies

We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of $^{136}$Xe. The measured two-neutrino double-beta decay half-life of $^{136}$Xe is $T_{1/2}^{2\nu} = 2.38 \pm 0.02(stat) \pm 0.14(syst) \times 10^{21}$ yr, consistent with a recent measurement by EXO-200. We also obtain a lower limit for the neutrinoless double-beta decay half-life, $T_{1/2}^{0\nu} > 5.7 \times 10^{24}$ yr at 90% confidence level (C.L.), which corresponds to almost a five-fold improvement over previous limits.