Limits on Majoron-emitting double-β decays of ^<136>Xe in the KamLAND-Zen experiment
Limits on Majoron-emitting double-β decays of ^<136>Xe in the KamLAND-Zen experiment
复制标题
KamLAND-Zen 实验中 ^<136>Xe 的 Majoron 发射双 β 衰变的限制
DOI：
10.1103/physrevc.86.021601
复制
发表时间：
2012
影响因子：
3.1
通讯作者：
et al. (The KamLAND-Zen Collaboration)
中科院分区：
文献类型：
--
作者：
A. Gando;et al. (The KamLAND-Zen Collaboration)
我们目前的限制的基础上，112.3天的曝光与125公斤的氚的Majoron发射中微子双衰变模式。特别地，在90 C. L.处获得了γ的普通（光谱指数）Majoron发射衰变半衰期的下限，比以前的限制严格五倍。使用一系列可用的核矩阵计算，有效的Majoron-neutrino耦合的相应上限为。这排除了先前不受约束的参数空间区域，并强烈限制了普通Majoron发射模式对中微子质量在倒置层次方案中衰变的可能贡献。
We present limits on Majoron-emitting neutrinoless double-decay modes based on an exposure of 112.3 days with 125 kg ofXe. In particular, a lower limit on the ordinary (spectral index) Majoron-emitting decay half-life ofXe is obtained asyr at 90C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the effective Majoron-neutrino coupling, using a range of available nuclear matrix calculations, is. This excludes a previously unconstrained region of parameter space and strongly limits the possible contribution of ordinary Majoron emission modes todecay for neutrino masses in the inverted hierarchy scheme.