Abstract

As a result of the p-type point contact germanium detectors’ ability to produce kg-scale radiation sensors with sub- \(keV_{ee}\) (electron equivalent energy) sensitivity, they have been preferred for light dark matter WIMP searches and the study of low energy neutrino physics. These detectors display anomalous behavior to events placed at the surface layer. The spectral shape and ratio methods are utilized to separate the bulk–surface events. The spectral shape technique relies on spectral shape assumptions and the use of external calibration sources to discriminate bulk–surface events. Whereas in ratio method to distinguish between bulk–surface events by employing ratios between several in situ event sample types as calibration sources. Here in this article we will present the comparison study of the two improved methods to separate the bulk–surface events. The bulk–surface separation results for both techniques are found to be comparable, but the main advantage of the ratio technique is its ability to calibrate systems using on-site data; this property makes it easier to collect long-term data and conduct large-scale multidetector research by reducing or eliminating the need for external \(\gamma\) -ray sources for calibration.

中文翻译：

---

亚$$keV_{ee}$$范围内点接触锗探测器物理事件选择时比率和谱形判别技术的比较研究

摘要

由于 p 型点接触锗探测器能够生产公斤级辐射传感器，其辐射传感器的亚级\(keV_{ee}\) （电子等效能量）灵敏度，它们已成为轻暗物质 WIMP 搜索和低能中微子物理研究的首选。这些探测器对位于表层的事件显示异常行为。光谱形状和比率方法用于分离体表面事件。光谱形状技术依赖于光谱形状假设和使用外部校准源来区分体表面事件。而在比率方法中，通过采用几种原位事件样本类型之间的比率作为校准源来区分体表面事件。在本文中，我们将介绍两种分离体表面事件的改进方法的比较研究。两种技术的体-表面分离结果具有可比性，但比率技术的主要优点是它能够使用现场数据校准系统；通过减少或消除对外部 \(\gamma\) 的需求，此属性可以更轻松地收集长期数据并进行大规模多探测器研究用于校准的射线源。