We report on the measurement of the two-neutrino double-β decay of Se82 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 ZnSe82, we determine the two-neutrino double-β decay half-life of Se82 with an unprecedented precision level, T1/22ν=[8.60±0.03(stat) -0.13+0.19(syst)]×1019 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.
Evidence of Single State Dominance in the Two-Neutrino Double- β Decay of Se 82 with CUPID-0 / Azzolini, O., Beeman, J.W., Bellini, F., Beretta, M., Biassoni, M., Brofferio, C., Bucci, C., Capelli, S., Cardani, L., Carniti, P., Casali, N., Chiesa, D., Clemenza, M., Cremonesi, O., Cruciani, A., Dafinei, I., Di Domizio, S., Ferroni, F., Gironi, L., Giuliani, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 123:26(2019), p. 262501. [10.1103/PhysRevLett.123.262501]
Evidence of Single State Dominance in the Two-Neutrino Double- β Decay of Se 82 with CUPID-0
Bellini F.;Casali N.;Cruciani A.;Ferroni F.;Vignati M.;
2019
Abstract
We report on the measurement of the two-neutrino double-β decay of Se82 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 ZnSe82, we determine the two-neutrino double-β decay half-life of Se82 with an unprecedented precision level, T1/22ν=[8.60±0.03(stat) -0.13+0.19(syst)]×1019 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.| File | Dimensione | Formato | |
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