论文标题
识别和模拟锗探测器的钝化表面上的表面α事件和金属化的影响
Identification and simulation of surface alpha events on passivated surfaces of germanium detectors and the influence of metalisation
论文作者
论文摘要
来自今元探测器表面的Alpha相互作用的事件是对基于锗的搜索中微子双β衰减的背景的主要贡献。表面事件可能会导致电荷诱捕，从而影响其脉搏形状和重建能量。提出了对分段的真实固也N型高纯晶锗探测器的钝化末端板的α事件的研究。详细分析了电荷陷阱，并通过在分段测试检测器的非收集通道中观察到的镜像脉冲验证了现有的脉冲分析技术来识别α事件。观察到的电荷诱捕的径向依赖性证实了先前的结果。第一次观察到电荷诱捕概率在晶体轴上的依赖性。引入了模拟软件solidstedetectors.jl中的第一个模型来描述电荷捕获效果。还提出了金属化对接近被钝化表面的低能伽马相互作用的事件的影响。
Events from alpha interactions on the surfaces of germanium detectors are a major contribution to the background in germanium-based searches for neutrinoless double-beta decay. Surface events are subject to charge trapping, affecting their pulse shape and reconstructed energy. A study of alpha events on the passivated end-plate of a segmented true-coaxial n-type high-purity germanium detector is presented. Charge trapping is analysed in detail and an existing pulse-shape analysis technique to identify alpha events is verified with mirror pulses observed in the non-collecting channels of the segmented test detector. The observed radial dependence of charge trapping confirms previous results. A dependence of the probability of charge trapping on the crystal axes is observed for the first time. A first model to describe charge trapping effects within the framework of the simulation software SolidStateDetectors.jl is introduced. The influence of metalisation on events from low-energy gamma interactions close to the passivated surface is also presented.
