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

作者：Abt I; Garbini L^*; Gooch C; Irlbeck S; Liu X; Palermo M; Schulz O

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2017, 858: 80-89.

DOI：10.1016/j.nima.2017.03.057

• HPGe detectors
• Position-sensitive devices
• Neutrinoless double-beta decay
• Background-reduction techniques

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 "effective dead layer" of less than 20 gin 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.

• 出版日期2017-6-21