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1. Limit on Neutrinoless ββ Decay of 136Xe from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in 76Ge.

Author

Gando, A., Gando, Y., Hanakago, H., Ikeda, H., Inoue, K., Ishidoshiro, K., Kato, R., Koga, M., Matsuda, S., Mitsui, T., Motoki, D., Nakada, T., Nakamura, K., Obata, A., Oki, A., Ono, Y., Otani, M., Shimizu, I., Shirai, J., and Suzuki, A.

Subjects
*NEUTRINOS, *BETA decay, *ELECTRONS, *GERMANIUM, *SENSITIVITY analysis
Abstract

We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of 136Xe. We obtain a lower limit for the neutrinoless double-beta decay half-life of T0v1/2 >1.9 × 1025 yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T0v1/2 > 3.4 × 1025 yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of

Published
2013
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