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Search of the neutrino-less double beta decay of$^{82}$ Se into the excited states of$^{82}$ Kr with CUPID-0

Abstract : 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$^{82}$ Se 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$^{82}$ Se into the 0$_1^+$ , 2$_1^+$ and 2$_2^+$ excited states of$^{82}$ Kr with an exposure of 5.74 kg $\cdot $ yr (2.24 $\times $ 10$^{25}$  emitters $\cdot $ yr). We found no evidence of the decays and set the most stringent limits on the widths of these processes: $\varGamma $ ($^{82}$ Se $\rightarrow ^{82}$ Kr$_{0_1^+}$ )8.55 $\times $ 10$^{-24}$  yr$^{-1}$ , $\varGamma $ ($^{82}$ Se $\rightarrow ^{82}$ Kr$_{2_1^+}$ ) $\,{<}\,6.25 \,{\times }\,10^{-24}$  yr$^{-1}$ , $\varGamma $ ($^{82}$ Se $\rightarrow ^{82}$ Kr$_{2_2^+}$ )8.25 $\times $ 10$^{-24}$  yr$^{-1}$ (90 $\%$ credible interval).
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Submitted on : Sunday, July 22, 2018 - 10:04:30 PM
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O. Azzolini, M.T. Barrera, J.W. Beeman, F. Bellini, M. Beretta, et al.. Search of the neutrino-less double beta decay of$^{82}$ Se into the excited states of$^{82}$ Kr with CUPID-0. Eur.Phys.J.C, 2018, 78 (11), pp.888. ⟨10.1140/epjc/s10052-018-6340-9⟩. ⟨hal-01846812⟩

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