Limit on neutrinoless ββ decay of Xe136 from the first phase of KamLAND-Zen and comparison with the positive claim in Ge76

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. SuzukiY. Takemoto, K. Tamae, K. Ueshima, H. Watanabe, B. D. Xu, S. Yamada, H. Yoshida, A. Kozlov, S. Yoshida, T. I. Banks, S. J. Freedman, B. K. Fujikawa, K. Han, T. O'Donnell, B. E. Berger, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, J. A. Detwiler, S. Enomoto, M. P. Decowski

研究成果: Article査読

371 被引用数 (Scopus)

抄録

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 Xe136. We obtain a lower limit for the neutrinoless double-beta decay half-life of T1/20ν>1.9×1025 yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T1/20ν>3.4×1025 yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of mββ <(120-250) meV based on a representative range of available matrix element calculations. Using those calculations, this result excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay detection claim in Ge76, reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L.

本文言語English
論文番号062502
ジャーナルPhysical review letters
110
6
DOI
出版ステータスPublished - 2013 2 7

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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