6533b824fe1ef96bd12810cb
RESEARCH PRODUCT
Evidence of Single State Dominance in the Two-Neutrino Double-β Decay of ^{82}Se with CUPID-0.
O. AzzoliniJ. W. BeemanF. BelliniM. BerettaM. BiassoniC. BrofferioC. BucciS. CapelliL. CardaniP. CarnitiN. CasaliD. ChiesaM. ClemenzaO. CremonesiA. CrucianiI. DafineiS. Di DomizioF. FerroniL. GironiA. GiulianiP. GorlaC. GottiG. KeppelJ. KotilaM. MartinezS. NagornyM. NastasiS. NisiC. NonesD. OrlandiL. PagnaniniM. PallaviciniL. PattavinaM. PavanG. PessinaV. PettinacciS. PirroS. PozziE. PrevitaliA. PuiuC. RusconiK. SchäffnerC. TomeiM. VignatiA. Zolotarovasubject
two-neutrinos double-β decay; nuclear matrix elements; scintillating cryogenic calorimetersDouble beta decay exited states nuclear modelnuclear matrix elementshiukkasfysiikkaydinfysiikkatwo-neutrinos double-β decayscintillating cryogenic calorimetersdescription
We report on the measurement of the two-neutrino double-β decay of ^{82}Se performed for the first time with cryogenic calorimeters, in the framework of the CUPID-0 experiment. With an exposure of 9.95 kg yr of Zn^{82}Se, we determine the two-neutrino double-β decay half-life of ^{82}Se with an unprecedented precision level, T_{1/2}^{2ν}=[8.60±0.03(stat) _{-0.13}^{+0.19}(syst)]×10^{19} yr. The very high signal-to-background ratio, along with the detailed reconstruction of the background sources allowed us to identify the single state dominance as the underlying mechanism of such a process, demonstrating that the higher state dominance hypothesis is disfavored at the level of 5.5σ.
year | journal | country | edition | language |
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2019-09-09 | Physical review letters |