First data from the CUPID-Mo neutrinoless double beta decay experiment

Abstract

The CUPID-Mo experiment is searching for neutrinoless double beta decay in ${}^{100}$Mo, evaluating the technology of cryogenic scintillating Li${}_2^{100}$MoO${}_4$ detectors for CUPID (CUORE Upgrade with Particle ID). CUPID-Mo detectors feature background suppression using a dual-readout scheme with Li${}_2$MoO${}_4$ crystals complemented by Ge bolometers for light detection. The detection of both heat and scintillation light signals allows the efficient discrimination of $\hat{I}\pm$ from ${\hat{I}}^3$&${\hat{I}}^2$ 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 6.7keV (FWHM) at 2615keV and an $\hat{I}\pm$ 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 $T_{1/2}^{0\hat{I}½}>3\times 10^{23}$yr for ${}^{100}$Mo and discuss the sensitivity of CUPID-Mo until the expected end of physics data taking in early 2020.

Proceedings for TAUP 2019, submitted to IOP Journal of Physics: Conference Series