Abstract

The time analysis of the signal induced by the drift of charge carriers in high purity germanium detectors provides information on the event topology. Millions of charge carriers are produced in a typical event. Their initial distribution, stochastic diffusion and Coulomb self-repulsion affect the time structure of the signal. We present a comprehensive study of these effects and evaluate their impact on the event discrimination capabilities for the three geometries which will be used in the Legend experiment for neutrinoless double-beta decay.

Highlights

  • An important field of applications for germanium detectors is the search for neutrinoless ββ decay (0νββ), a nuclear transition predicted by many extensions of the Standard Model of particle physics in which two neutrons decay simultaneously into two protons and two electrons

  • Simulations have been extensively used in gamma-spectroscopy, such as modeling the segmented detectors of AGATA and GRETA [8,9], while in 0νββ experiments they led to Broad Energy Germanium (BEGe) and P-type Point Contact (PPC) detectors [10,11]

  • The difference between the two cases is less than 0.5% of the signal amplitude in BEGe and PPC detectors, but it is larger for inverted coaxials, where the maximum of the current signal is lowered by ∼ 2% when group effects are switched on

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Summary

Introduction

An important field of applications for germanium detectors is the search for neutrinoless ββ decay (0νββ), a nuclear transition predicted by many extensions of the Standard Model of particle physics in which two neutrons decay simultaneously into two protons and two electrons. For this search, detectors are fabricated from germanium material isotopically enriched to ∼ 90% in the candidate doublebeta decaying isotope 76Ge. the decay occurs inside the detector and the electrons are absorbed within O(mm), producing a point-like energy deposition. In the effort to increase the detector mass, new geometries such as the Inverted Coaxial (IC) [12] have recently drawn increasing attention In this new type of detectors, the time needed to collect electrons and holes is much longer than in the aforementioned geometries.

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Charge-carrier collection and signal formation in germanium detectors
Charge-carrier collective effects
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Event discrimination in 0νββ experiments
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Conclusions and discussion
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Findings
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