The background model of the CUPID-Mo $0\nu \beta \beta$ experiment

Abstract

CUPID-Mo, located in the Laboratoire Souterrain de Modane (France), was a demonstrator for the next generation $0\nu \beta \beta$ decay experiment, CUPID. It consisted of an array of 20 enriched Li${}_2$${}^{100}$MoO${}_4$ bolometers and 20 Ge light detectors and has demonstrated that the technology of scintillating bolometers with particle identification capabilities is mature. Furthermore, CUPID-Mo can inform and validate the background prediction for CUPID. In this paper, we present a detailed model of the CUPID-Mo backgrounds. This model is able to describe well the features of the experimental data and enables studies of the $2\nu \beta \beta$ decay and other processes with high precision. We also measure the radio-purity of the Li${}_2$${}^{100}$MoO${}_4$ crystals which are found to be sufficient for the CUPID goals. Finally, we also obtain a background index in the region of interest of 3.7${}_{-0.8}^{+0.9}$(stat)${}_{-0.7}^{+1.5}$(syst)$\times 10^{-3}$counts/$\Delta$E${}_{FWHM}$/mol${}_{iso}$/yr, the lowest in a bolometric $0\nu \beta \beta$ decay experiment.

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• A novel mechanical design of a bolometric array for the CROSS double-beta decay experiment
• BINGO innovative assembly for background reduction in bolometric $0\nu \beta \beta$ experiments
• First demonstration of a TES based cryogenic Li${}_2$MoO${}_4$detector for neutrinoless double beta decay search
• Search for Sterile Neutrinos with CUPID-0
• Exploring the keV-scale physics potential of CUORE