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arXiv 2003.04756physics.ins-det
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TRISTAN计划硅漂移探测器的探测器对电子响应特性

Characterization of the Detector Response to Electrons of Silicon Drift Detectors for the TRISTAN Project

Manuel Lebert, Tim Brunst, Thibaut Houdy, Susanne Mertens, Daniel Siegmann

摘要:

右手中微子是粒子物理学标准模型的自然延伸。这样的粒子只会通过与左手中微子的混合而相互作用,因此它们被称为无菌中微子。如果它们的质量在keV范围内,它们将是暗物质的候选者。通过研究氚β衰变的电子能谱,可以探测到质量达到18.6 keV端点的参数空间。无菌中微子在光谱中表现为一种扭结状结构。为了实现这一目标,TRISTAN项目为KATRIN实验开发了一种新的探测器系统,可以使用硅漂移探测器技术搜索这些新粒子。对探测器性能的一个主要影响是所谓的死层。在这里,提出了一种新的表征方法的原型探测器使用Kr-83 m衰变转换电子。通过倾斜探测器,其有效死层增加,这导致不同的峰位置。两个倾斜角之间的峰值位置的差异与源效应无关,因此适合于表征。然后将测量结果与蒙特卡罗模拟进行比较,提取死层。发现了50 nm量级的死层。

英文摘要:

Right-handed neutrinos are a natural extension of the Standard Model of particle physics. Such particles would only interact through the mixing with the left-handed neutrinos, hence they are called sterile neutrinos. If their mass were in the keV-range they would be Dark Matter candidates. By investigating the electron spectrum of the tritium beta-decay the parameter space with masses up to the endpoint of 18.6 keV can be probed. A sterile neutrino manifests as a kink-like structure in the spectrum. To achieve this goal the TRISTAN project develops a new detector system for the KATRIN experiment that can search for these new particles using the silicon drift detector technology. One major effect on the performance of the detectors is the so called dead layer. Here, a new characterization method for the prototype detectors is presented using the Kr-83m decay conversion electrons. By tilting the detector its effective dead layer increases, which leads to different peak positions. The difference of peak positions between two tilting angles is independent of source effects and is thus suitable for characterization.A dead layer is then extracted by comparing the measurements to Monte-Carlo simulations. A dead layer in the order of 50 nm was found.

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