Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment

Abstract

A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and ${}^{70}$Ge depleted germanium detectors. The production rates of long-lived radionuclides were calculated with Geant4 and CRY. Results were validated by comparing the simulated and experimental spectra of CDEX-1B detector. Based on the validated codes, the cosmogenic background level was predicted for further tonne-scale CDEX experiment. The suppression of cosmogenic background level could be achieved by underground germanium crystal growth and high-purity germanium detector fabrication to reach the sensitivity requirement for direct detection of dark matter. With the low cosmogenic background, new physics channels, such as solar neutrino research and neutrinoless double-beta decay experiments, were opened and the corresponding simulations and evaluations were carried out.

arXiv commentVersion accepted by SCPMA; 10 pages, 13 figures, 7 tables

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Cited by in corpus (10)

• Neutrinoless Double-Beta Decay: Status and Prospects
• Fabrication and Characterization of High-Purity Germanium Detectors with Amorphous Germanium Contacts
• Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search
• First experimental constraints on WIMP couplings in the effective field theory framework from CDEX
• SAGE : A Monte Carlo Simulation Framework for Experiments with Germanium Detectors
• Cosmogenic activation in double beta decay experiments
• Projected WIMP sensitivity of the CDEX-50 dark matter experiment
• Study of cosmogenic activation above ground for the DarkSide-20k experiment
• Cosmogenic background study for a 100Mo-based bolometric demonstration experiment at China JinPing underground Laboratory
• Study of cosmogenic activation in ${}^{76}$Ge enriched germanium detectors during fabrication and transportation above ground