Alpha-event and surface characterisation in segmented true-coaxial HPGe detectors

Iris Abt; Lucia Garbini; Chris Gooch; Sabine Irlbeck; Xiang Liu; Matteo Palermo; Oliver Schulz

doi:10.1016/j.nima.2017.03.057

Alpha-event and surface characterisation in segmented true-coaxial HPGe detectors

Instrumentation and Detectors 2018-01-30 v2 High Energy Physics - Experiment

Authors: Iris Abt , Lucia Garbini , Chris Gooch , Sabine Irlbeck , Xiang Liu , Matteo Palermo , Oliver Schulz

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Abstract

A detailed study of alpha interactions on the passivation layer on the end-plate of a true-coaxial high-purity germanium detector is presented. The observation of alpha events on such a surface indicates an unexpectedly thin so-called "dead layer" of less than 20 {\mu}m thickness. In addition, the influence of the metalisation close to the end-plate on the time evolution of the output pulses is discussed. The results indicate that alpha contamination can result in events which could be mistaken as signals for neutrinoless double beta decay and provide some guidance on how to prevent this.

Keywords

high-purity germanium detector alpha interactions dead layer passivation layer neutrinoless double beta decay pulse shape analysis surface contamination

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@article{arxiv.1611.00165,
  title  = {Alpha-event and surface characterisation in segmented true-coaxial HPGe detectors},
  author = {Iris Abt and Lucia Garbini and Chris Gooch and Sabine Irlbeck and Xiang Liu and Matteo Palermo and Oliver Schulz},
  journal= {arXiv preprint arXiv:1611.00165},
  year   = {2018}
}

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14 pages, 14 figures, published in Nuclear Instruments and Methods in Physics Research A

Alpha-event and surface characterisation in segmented true-coaxial HPGe detectors

Abstract

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