$^{76}$ Ge双β衰变事件的拓扑结构和校准程序偏差
Topologies of $^{76}$Ge double-beta decay events and calibration procedure biases
摘要：
通过对锗探测器中能量沉积产生的电信号的时间分布进行分析，可以区分具有不同拓扑结构的事件。这对于寻找$^{76}$ Ge的无中微子双β衰变的实验尤其重要，以区分所寻找的信号和其他背景源。用于调整双β衰变事件的选择标准的标准校准程序使用$^{228}$ Th源，因为它提供信号样事件的样本。与无中微子双β衰变事件相比，这些样品表现出具有细微不同拓扑结构的能量空间分布。在这项工作中，我们将这些拓扑结构的差异，并与支持的$^{56}$合作来源，评估偏差和精度的校准技术，使用这样的事件样本。我们的结果将是特别相关的未来的实验中，需要一个坚实的估计的效率。
英文摘要：
The analysis of the time profile of electrical signals produced by energy depositions in germanium detectors allows discrimination of events with different topologies. This is especially relevant for experiments searching for the neutrinoless double beta decay of $^{76}$Ge to distinguish the sought-after signal from other background sources. The standard calibration procedures used to tune the selection criteria for double-beta decay events use a $^{228}$Th source, because it provides samples of signal-like events. These samples exhibit energy spatial distributions with subtle different topologies compared to neutrinoless double-beta decay events. In this work, we will characterize these topological differences and, with the support of a $^{56}$Co source, evaluate biases and precision of calibration techniques which use such event samples. Our results will be particularly relevant for future experiments in which a solid estimation of the efficiency is required.
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