Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 78, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-018-6340-9
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Funding
- Low-background Underground Cryogenic Installation For Elusive Rates (LUCIFER)
- ERC under the European Union [247115]
- Initiative Doctorale Interdisciplinaire 2015 project - Initiatives d'excellence Paris-Saclay [ANR-11-IDEX-0003-0]
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The CUPID-0 experiment searches for double beta decay using cryogenic calorimeters with double (heat and light) read-out. The detector, consisting of 24 ZnSe crystals 95% enriched in Se-82 and two natural ZnSe crystals, started data-taking in 2017 at Laboratori Nazionali del Gran Sasso. We present the search for the neutrino-less double beta decay of Se-82 into the 0(1)(+), 2(1)(+) and 2(2)(+) excited states of Kr-82 with an exposure of 5.74 kg.yr (2.24 x 10(25) emitters.yr). We found no evidence of the decays and set the most stringent limits on the widths of these processes: Gamma(Se-82 -> Kr-82(01+)) < 8.55 x 10(-24) yr(-1), Gamma (Se-82 -> Kr-82(21+)) < 6.25 x 10(-24) yr(-1), Gamma(Se-82 -> Kr-82(22+)) < 8.25 x 10(-24) yr(-1) (90% credible interval).
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