Final results on the [Formula omitted] decay half-life limit of [Formula omitted]Mo from the CUPID-Mo experiment

The CUPID-Mo experiment to search for 0 [Formula omitted] decay in [Formula omitted]Mo has been recently completed after about 1.5 years of operation at Laboratoire Souterrain de Modane (France). It served as a demonstrator for CUPID, a next generation 0 [Formula omitted] decay experiment. CUPID-Mo...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2022-11, Vol.82 (11)
Main Authors: Augier, C, Barabash, A. S, Bellini, F, Benato, G, Beretta, M, Bergé, L, Billard, J
Format: Article
Language:English
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Summary:The CUPID-Mo experiment to search for 0 [Formula omitted] decay in [Formula omitted]Mo has been recently completed after about 1.5 years of operation at Laboratoire Souterrain de Modane (France). It served as a demonstrator for CUPID, a next generation 0 [Formula omitted] decay experiment. CUPID-Mo was comprised of 20 enriched [Formula omitted] [Formula omitted] [Formula omitted] scintillating calorimeters, each with a mass of [Formula omitted] kg, operated at [Formula omitted] mK. We present here the final analysis with the full exposure of CUPID-Mo ( [Formula omitted]Mo exposure of 1.47 [Formula omitted]) used to search for lepton number violation via 0 [Formula omitted] decay. We report on various analysis improvements since the previous result on a subset of data, reprocessing all data with these new techniques. We observe zero events in the region of interest and set a new limit on the [Formula omitted]Mo 0 [Formula omitted] decay half-life of [Formula omitted] [Formula omitted] year (stat. + syst.) at 90% CI. Under the light Majorana neutrino exchange mechanism this corresponds to an effective Majorana neutrino mass of [Formula omitted] [Formula omitted] eV, dependent upon the nuclear matrix element utilized.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-022-10942-5