Background Model of the CUPID-0 Experiment

Abstract

CUPID-0 is the first large mass array of enriched Zn${}^{82}$Se scintillating low temperature calorimeters, operated at LNGS since 2017. During its first scientific runs, CUPID-0 collected an exposure of 9.95 kg yr. Thanks to the excellent rejection of $\alpha$ particles, we attained the lowest background ever measured with thermal detectors in the energy region where we search for the signature of ${}^{82}$Se neutrinoless double beta decay. In this work we develop a model to reconstruct the CUPID-0 background over the whole energy range of experimental data. We identify the background sources exploiting their distinctive signatures and we assess their extremely low contribution (down to $\sim 10^{-4}$ counts/(keV kg yr)) in the region of interest for ${}^{82}$Se neutrinoless double beta decay search. This result represents a crucial step towards the comprehension of the background in experiments based on scintillating calorimeters and in next generation projects such as CUPID.

This is a post-peer-review, pre-copyedit version of an article published in Eur. Phys. J. C. The final authenticated version is available online at: https://doi.org/10.1140/epjc/s10052-019-7078-8

References in corpus (4)

• Phase space factors for double-$\beta$ decay
• Measurement of the Two-Neutrino Double Beta Decay Half-life of ${}^{130}$Te with the CUORE-0 Experiment
• Validation of techniques to mitigate copper surface contamination in CUORE
• First Direct Double-Beta Decay Q-value Measurement of 82Se in Support of Understanding the Nature of the Neutrino

Cited by in corpus (6)

• Final result of CUPID-0 phase-I in the search for the ${}^{82}$Se Neutrinoless Double Beta Decay
• First search for Lorentz violation in double beta decay with scintillating calorimeters
• Search for double $\beta$-decay modes of ${}^{64}$Zn using purified zinc
• Double Beta Decay Experiments at Canfranc Underground Laboratory
• Results on ${}^{82}$Se $2\nu \beta \beta$ with CUPID-0 Phase I
• Double beta decay results from the CUPID-0 experiment