论文标题
搜索具有Kamland-Zen的倒数大量订购区中中微子的主要性质
Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen
论文作者
论文摘要
Kamland-Zen实验已使用Xenon载荷的液体闪烁体对中性s的Double-beta（$0νββ$）的半衰期提供了严格的约束。我们报告了使用升级的检测器的改进搜索，其氙气和超级放射性容器的数量几乎是两倍，对应于$^{136} $ XE的970 kg yr。这些新数据为背景提供了宝贵的见解，尤其是从Xenon的宇宙MUON散布中，并且需要使用新型的背景拒绝技术。我们获得了$0νββ$衰减的下限，$ t_ {1/2}^{0ν}> 2.3 \ times 10^{26} $ yr在90％c.l.上，对应于有效的Majorana Neutrino质量的上部限制，使用常用核矩阵元素的36-156 MEV的有效majorana Netrino质量。
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0νββ$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the $0νββ$ decay half-life of $T_{1/2}^{0ν} > 2.3 \times 10^{26}$ yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations.
