A1 Journal article (refereed)
Evidence of Single State Dominance in the Two-Neutrino Double-β Decay of 82Se with CUPID-0 (2019)

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., . . . Zolotarova, A. (2019). Evidence of Single State Dominance in the Two-Neutrino Double-β Decay of 82Se with CUPID-0. Physical Review Letters, 123(26), Article 262501. https://doi.org/10.1103/PhysRevLett.123.262501

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Publication details

All authors or editors: Azzolini, O.; Beeman, J. W.; Bellini, F.; Beretta, M.; Biassoni, M.; Brofferio, C.; Bucci, C.; Capelli, S.; Cardani, L.; Carniti, P.; et al.

Journal or series: Physical Review Letters

ISSN: 0031-9007

eISSN: 1079-7114

Publication year: 2019

Volume: 123

Issue number: 26

Article number: 262501

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevLett.123.262501

Publication open access:

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/67340

Publication is parallel published: https://arxiv.org/abs/1909.03397

Abstract

We report on the measurement of the two-neutrino double-β decay of 82Se performed for the first time with cryogenic calorimeters, inthe framework of theCUPID-0experiment. With anexposureof 9.95 kg yr of Zn82Se, we determine the two-neutrino double-β decay half-life of 82Se with an unprecedentedprecision level, T2ν½ = [8.60 0.03(stat)þ0.19 −0.13(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.

Keywords: nuclear physics; particle physics

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 3