UCLA

Abstract: The CUPID-Mo experiment is searching for neutrinoless double beta decay in 100Mo, evaluating the technology of cryogenic scintillating Li2 100MoO4 detectors for CUPID (CUORE Upgrade with Particle ID). CUPID-Mo detectors feature background suppression using a dual-readout scheme with Li2MoO4 crystals complemented by Ge bolometers for light detection. The detection of both heat and scintillation light signals allows the efficient discrimination of α from γ&β events. In this proceedings, we discuss results from the first 2 months of data taking in spring 2019. In addition to an excellent bolometric performance of 6.7 keV (FWHM) at 2615 keV and an β separation of better than 99.9% for all detectors, we report on bulk radiopurity for Th and U. Finally, we interpret the accumulated physics data in terms of a limit of T 1 / 2 0 v > 3 × 1023 yr for 100Mo and discuss the sensitivity of CUPID-Mo until the expected end of physics data taking in early 2020.