Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.262501
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Funding
- European Research Council [247115]
- Academy of Finland [314733]
- Academy of Finland (AKA) [314733, 314733] Funding Source: Academy of Finland (AKA)
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We report on the measurement of the two-neutrino double beta decay of Se-82 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 (ZnSe)-Se-82, we determine the two-neutrino double-beta decay half-life of Se-82 with an unprecedented precision level, T-1/2(2v) = [8 60 +/- 0.03(stat)(-0.13)(+0.19) (syst)] x 10(19) yr. The very high signal-to-background ratio, along 1/2 L 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 5.5 sigma.
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