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arXiv · 2401.09837

Prototyping a High Purity Germanium cryogenic veto system for a bolometric detection experiment

Chloé Goupy·Stefanos Marnieros·Beatrice Mauri·Claudia Nones·Matthieu Vivier
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Abstract

The use of High Purity Germanium detectors operated in ionization mode at cryogenic temperatures is investigated as an external background mitigation solution for bolometers used in rare-event search experiments. A simple experimental setup with very partial coverage, running a 52-g $\mathrm{Li_2WO_4}$ bolometer sandwiched in-between two 2-cm thick High Purity Germanium cylindrical detectors in a dry cryostat, shows promising rejection to environmental gammas and atmospheric muons backgrounds. The acquired data are used together with a Monte Carlo simulation of the setup to extract the main contributions to the external backgrounds expected in an above ground experiment, such as e.g.~current and future experimental efforts targeting the detection of coherent elastic neutrino-nucleus scattering at reactor facilities. Based on all these results, a $\mathrm{4\pi}$ coverage similar veto system achieving a $\mathcal{O}$(10 keV) energy threshold is expected to achieve a $\mathrm{\gtrsim}$ 70 \% and a $\mathrm{\gtrsim}$ 97 \% rejection power for gamma-like and muon-like events, respectively.

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Chloé Goupy, Stefanos Marnieros, Beatrice Mauri, Claudia Nones, Matthieu Vivier. 2024-01-18. Prototyping a High Purity Germanium cryogenic veto system for a bolometric detection experiment. https://doi.org/10.1016/j.nima.2024.169383

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