New Results from the CUPID-Mo demonstrator on the 100Mo 0νββ decay half-life

31 Aug 2021, 17:10
1h 30m
Talk in parallel session Neutrino physics and astrophysics Discussion Panel Neutrinos 3


Bradford Welliver (LBNL)


CUPID-Mo served as a successful demonstrator experiment for CUPID (CUORE Upgrade with Particle ID), the planned next-generation upgrade of the first ton scale cryogenic calorimetric $0\nu\beta\beta$ decay experiment, CUORE (Cryogenic Underground Observatory for Rare Events). CUPID-Mo was operated at Laboratoire Souterrain de Modane in France as an array of 20 enriched Li$_{2}$$^{100}$MoO$_{4}$ (LMO) cylindrical scintillating crystals ($\sim$200g each) each featuring a Ge light detector (LD) all at $\sim$20 mK. The LMOs and LDs were instrumented with NTD thermistors allowing for the collection of both heat and scintillation light. This dual mode of energy collection allows for $\alpha$ events to be distinguished from $\beta$/$\gamma$ events, significantly reducing the background from degraded $\alpha$s in the heat channel. CUPID-Mo has a demonstrated energy resolution of $\sim$7 keV (FWHM) at 2615 keV, complete $\alpha$/$(\beta$/$\gamma)$ discrimination and very low radioactive contamination. Here we report the results of an analysis of the full CUPID-Mo exposure, detailing improved analysis techniques and present an updated limit on the $0\nu\beta\beta$ decay half-life for $^{100}$Mo. We also will describe the status of other ongoing analysis efforts underway with the CUPID-Mo dataset.

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