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First Result on the Neutrinoless Double-$\beta$ Decay of $^{82}Se$ with CUPID-0

Abstract : We report the result of the search for neutrinoless double beta decay of Se82 obtained with CUPID-0, the first large array of scintillating ZnSe82 cryogenic calorimeters implementing particle identification. We observe no signal in a 1.83 kg yr Se82 exposure, and we set the most stringent lower limit on the 0νββ Se82 half-life T1/20ν>2.4×1024  yr (90% credible interval), which corresponds to an effective Majorana neutrino mass mββ<(376–770)  meV depending on the nuclear matrix element calculations. The heat-light readout provides a powerful tool for the rejection of α particles and allows us to suppress the background in the region of interest down to (3.6-1.4+1.9)×10-3  counts/(keV kg yr), an unprecedented level for this technique.
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Submitted on : Tuesday, March 6, 2018 - 8:13:00 PM
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O. Azzolini, M.T. Barrera, J.W. Beeman, F. Bellini, M. Beretta, et al.. First Result on the Neutrinoless Double-$\beta$ Decay of $^{82}Se$ with CUPID-0. Phys.Rev.Lett., 2018, 120 (23), pp.232502. ⟨10.1103/PhysRevLett.120.232502⟩. ⟨hal-01724888⟩



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