Speaker
Description
The CUPID-Mo experiment, located in the Laboratoire Souterrain de Modane (France) is a demonstrator for the next generation 0νββ experiment CUPID. The experiment is an array of 20 enriched Li$_2$$ ^{100}$MoO$_4$ bolometers and 20 Ge light detectors, working at ~ 20 mK. The experiment has collected data from spring 2019 to summer 2020, for a total exposure of 2.71 kg.yr and set a leading limit on the half-life of 0νββ decay of $^{100}$Mo (T$_{1/2}$ > 1.8 x 10$^{24}$ yr (syst. + stat.) at 90% C.L.). We have developed GEANT4 Monte-Carlo simulations with a detailed geometry of the set-up, and the detector response (resolution, time of the decays, light yield) was applied. The Monte-Carlo simulations are used as an input for the construction of a background model which describes the background sources int the CUPID-Mo experiment. The model is based on a global simultaneous fit of CUPID-Mo data to the Monte-Carlo simulations, with a Bayesian approach. This allows us to obtain the crystal bulk and surface contaminations, that provide important inputs for the background considerations of the CUPID experiment. In this poster we present the details of the background model study, the resulting activities from crystal bulk and surface, and the background index in the 0νββ region of interest.
| Collaboration | CUPID-Mo |
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