CUPID-0 is the first pilot experiment of CUPID, a next-generation project for the measurement of neutrinoless double beta decay (0 nu DBD) with scintillating bolometers. The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from June 2017 to December 2018, collecting a Se-82 exposure of 5.29 kg x yr. In this Letter we present the phase-I results in the search for O nu DBD. We demonstrate that the technology implemented by CUPID-0 allows us to reach the lowest background for calorimetric experiments: (3.5(-0.9)(+1.0)) x 10(-3) counts/ (keV kg yr). Monitoring 3.88 x 10(25) Se-82 nuclei x yr we reach a 90% credible interval median sensitivity of T-1/2(0 nu) > 5.0 x 10(24) yr and set the most stringent limit on the half-life of Se-82 O nu DBD: T-1/2(0 nu) > 3.5 x 10(24) yr (90% credible interval), corresponding to m(beta beta) < (311-638) meV depending on the nuclear matrix element calculations.
Final Result of CUPID-0 Phase-I in the Search for the Se 82 Neutrinoless Double- β Decay / 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.; Giuliani, A.; Gorla, P.; Gotti, C.; Keppel, G.; Martinez, M.; Nagorny, S.; Nastasi, M.; Nisi, S.; Nones, C.; Orlandi, D.; Pagnanini, L.; Pallavicini, M.; Pattavina, L.; Pavan, M.; Pessina, G.; Pettinacci, V.; Pirro, S.; Pozzi, S.; Previtali, E.; Puiu, A.; Rusconi, C.; Schaffner, K.; Tomei, C.; Vignati, M.; Zolotarova, A. S.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1079-7114. - 123:3(2019), p. 032501. [10.1103/PhysRevLett.123.032501]
Final Result of CUPID-0 Phase-I in the Search for the Se 82 Neutrinoless Double- β Decay
Bellini F.;Cardani L.;Casali N.;Cruciani A.;Dafinei I.;Ferroni F.;Vignati M.;
2019
Abstract
CUPID-0 is the first pilot experiment of CUPID, a next-generation project for the measurement of neutrinoless double beta decay (0 nu DBD) with scintillating bolometers. The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from June 2017 to December 2018, collecting a Se-82 exposure of 5.29 kg x yr. In this Letter we present the phase-I results in the search for O nu DBD. We demonstrate that the technology implemented by CUPID-0 allows us to reach the lowest background for calorimetric experiments: (3.5(-0.9)(+1.0)) x 10(-3) counts/ (keV kg yr). Monitoring 3.88 x 10(25) Se-82 nuclei x yr we reach a 90% credible interval median sensitivity of T-1/2(0 nu) > 5.0 x 10(24) yr and set the most stringent limit on the half-life of Se-82 O nu DBD: T-1/2(0 nu) > 3.5 x 10(24) yr (90% credible interval), corresponding to m(beta beta) < (311-638) meV depending on the nuclear matrix element calculations.| File | Dimensione | Formato | |
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