Limit on neutrinoless ββ decay of 136Xe from the first phase of KamLAND-Zen and comparison with the positive claim in 76Ge.
Journal: Physical Review Letters
Published:
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 (136)Xe. We obtain a lower limit for the neutrinoless double-beta decay half-life of T(1/2)(0ν)>1.9×10(25) yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T(1/2)(0ν)>3.4×10(25) yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of
Authors
A Gando, Y Gando, H Hanakago, H Ikeda, K Inoue, K Ishidoshiro, R Kato, M Koga, S Matsuda, T Mitsui, D Motoki, T Nakada, K Nakamura, A Obata, A Oki, Y Ono, M Otani, I Shimizu, J Shirai, A Suzuki, Y Takemoto, K Tamae, K Ueshima, H Watanabe, B Xu, S Yamada, H Yoshida, A Kozlov, S Yoshida, T Banks, S Freedman, B Fujikawa, K Han, T O'donnell, B Berger, Y Efremenko, H Karwowski, D Markoff, W Tornow, J Detwiler, S Enomoto, M Decowski