Enhanced search sensitivity to the double beta decay of Xe-136 to excited states with topological signatures
Enhanced search sensitivity to the double beta decay of Xe-136 to excited states with topological signatures
复制标题
增强了对 Xe-136 的双 β 衰变到具有拓扑特征的激发态的搜索灵敏度
DOI：
10.1007/s11433-020-1693-6
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Wang Shaobo
中科院分区：
文献类型：
--
作者：
Xie Chen;Ni Kaixiang;Han Ke;Wang Shaobo
~（136）Ba ~（136）这种衰变的实验特征，一个或两个伽马射线后的β信号，可以更有效地确定在气体探测器的帮助下，拓扑签名。我们已经研究了DBD-ES的粒子轨迹的Monte Carlo模拟数据的建议PandaX-III探测器作为一个例子的关键参数。拓扑分析可以在保留一半以上信号的情况下，将背景速率降低约一个数量级。DBD-ES的半衰期灵敏度可提高1.8倍至4.1× 1023年（90% C.L.）。同样地，136 Ba的激发态对136 Ba的无中微子双β衰变的半衰期灵敏度可以通过拓扑特征提高4.8倍。
The double beta decay of136Xe to excited states of136Ba (DBD-ES) has not yet been discovered experimentally. The experimental signature of such decays, one or two gamma rays following the beta signals, can be identified more effectively in a gaseous detector with the help of topological signatures. We have investigated key parameters of particle trajectories of DBD-ES with Monte Carlo simulation data of the proposed PandaX-III detector as an example. The background rates can be reduced by about one order of magnitude while keeping more than half of signals with topological analysis. The estimated half-life sensitivity of DBD-ES can be improved by 1.8 times to 4.1×1023year (90% C.L.). Similarly, the half-life sensitivity of neutrinoless double beta decay of136Xe to excited states of136Ba can be improved by a factor of 4.8 with topological signatures.