Limit on neutrinoless ββ decay of 136Xe from the first phase of KamLAND-Zen and comparison with the positive claim in 76Ge.
Limit on neutrinoless ββ decay of 136Xe from the first phase of KamLAND-Zen and comparison with the positive claim in 76Ge.
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DOI：
10.1103/physrevlett.110.062502
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发表时间：
2012-11
影响因子：
8.6
通讯作者：
A. Gando;Y. Gando;H. Hanakago;H. Ikeda;K. Inoue;K. Inoue;K. Ishidoshiro;R. Kato;M. Koga
中科院分区：
文献类型：
--
作者：
A. Gando;Y. Gando;H. Hanakago;H. Ikeda;K. Inoue;K. Inoue;K. Ishidoshiro;R. Kato;M. Koga
我们给出了卡姆兰德-禅双β衰变实验第一阶段的结果，对应于89.5公斤年暴露的(136)Xe。我们得到了90%C.L.时T(1/2)(0ν)和GT；1.9×10(25)yr的无中微子双β衰变半衰期的下限。结合Kamland-Zen和EXO-200的结果，得到了90%C.L.时T(1/2)(0ν)和GT；3.4×10(25)yr的下限，这相当于基于一系列有代表性的矩阵元计算得出的Majorana中微子质量极限。使用这些计算，这一结果排除了海德堡-莫斯科合作的一部分报告的(76)Ge中无中微子双β衰变探测主张的Majorana中微子质量范围，超过97.5%C.L.
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 <(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 (76)Ge, reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L.