论文标题
增强对具有拓扑特征的激发态的$^{136} $ XE的双β衰减的搜索敏感性
Enhanced search sensitivity to the double beta decay of $^{136}$Xe to excited states with topological signatures
论文作者
论文摘要
$^{136} $ XE的双β衰减尚未通过实验发现$^{136} $ ba（dbd-es）的激发态。可以在拓扑特征的帮助下，在气态探测器中更有效地识别此类衰减的实验特征，即在Beta信号之后的一两个伽玛射线。我们已经研究了DBD-E的粒子轨迹的关键参数，并以蒙特卡洛模拟数据的数据为例。可以将背景速率降低约一个数量级，同时通过拓扑分析保留超过一半的信号。 DBD-ES的估计半衰期灵敏度可以提高1.8次，4.1 $ \ times $ 10 $^{23} $ yr（90 \％Cl）。同样，$^{136} $ XE中性元双β衰减对$^{136} $ ba激发态的半衰期敏感性可以提高4.8倍的拓扑特征。
Double beta decay of $^{136}$Xe to excited states of $^{136}$Ba (DBD-ES) has not yet been discovered experimentally yet. 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$\times$10$^{23}$ yr (90\% CL). Similarly, the half-life sensitivity of neutrinoless double beta decay of $^{136}$Xe to excited states of $^{136}$Ba can be improved by a factor of 4.8 with topological signatures.
