Speaker
Description
CUPID-0 is a pilot experiment in scintillating cryogenic calorimetry for the search of neutrino-less double beta decay. 26 ZnSe crystals coupled to bolometric light detectors were operated continuously for two years. From its successful experience comes a demonstration of full alpha to beta/gamma background separation, the most stringent limit on the 82Se neutrino-less double beta decay, as well as the most precise measurement of the 82Se two-neutrino double beta decay half-life. We developed a model to constrain the contribution of several sources in a wide energy region, demonstrating that CUPID-0 reached unprecedented low levels of background in the region of interest at the Q-value of 82Se. CUPID-0 is sensitive to the spectral shape of the two-neutrino double beta decay, and it already provided evidence for its single state dominance. In this contribution we search for spectral distortions due to exotic decay modes. Through a Bayesian approach we investigate the Lorentz violation in the two-neutrino double beta decay and several conjuctured models providing the neutrino-less double beta decay with the emission of a Majoron-like particle
