Evidence of Single State Dominance in the Two-Neutrino Double-β Decay of 82Se 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., . . . 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
Published in
Physical Review LettersDate
2019Copyright
© 2019 American Physical Society
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.
Publisher
American Physical SocietyISSN Search the Publication Forum
0031-9007Keywords
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/34151518
Metadata
Show full item recordCollections
Related funder(s)
Academy of FinlandFunding program(s)
Academy Research Fellow, AoF; Research costs of Academy Research Fellow, AoF
Additional information about funding
This work was partially supported by the European Research Council (FP7/2007-2013), Contract No. 247115. The work of J.K. was supported by the Academy of Finland (Grant No. 314733).License
Except where otherwise noted, this item's license is described as In Copyright