Results on double beta decay of 82Se with CUPID-0 Phase i

Pagnanini, L.; 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.; Nagorny, S.; Nastasi, M.; Nisi, S.; Nones, C.; Orlandi, D.; 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.

doi:10.1063/1.5130980

CUPID-0 is the first neutrinoless double beta decay (0νββ) experiment based on highly enriched scintillating bolometers. It consists in an array of Zn82Se detectors operated at LNGS since 2017. During the Phase I of data taking, concluded at the end of 2018, the experiment collected an exposure of 9.95 kg·yr of ZnSe. The simultaneous heat-light readout provides a powerful rejection of α-particles and allows us to suppress the background in the region of interest down to 3.5-0.9+1.0×10-3 counts/(keV·kg·y), an unprecedented level for this technique. Thanks to this achievement, we set the most stringent lower limit on the 82Se 0νββ half-life. Moreover, we have developed a full background model, which allows us to identify the origin of the events in the region of interest. The reconstruction of the CUPID-0 spectrum has enabled us to perform the most precise measurement of the 2νββ of 82Se.

Results on double beta decay of 82Se with CUPID-0 Phase i

Pagnanini L.;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.;Nagorny S.;Nastasi M.;Nisi S.;Nones C.;Orlandi D.;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.

2019-01-01

Abstract

CUPID-0 is the first neutrinoless double beta decay (0νββ) experiment based on highly enriched scintillating bolometers. It consists in an array of Zn82Se detectors operated at LNGS since 2017. During the Phase I of data taking, concluded at the end of 2018, the experiment collected an exposure of 9.95 kg·yr of ZnSe. The simultaneous heat-light readout provides a powerful rejection of α-particles and allows us to suppress the background in the region of interest down to 3.5-0.9+1.0×10-3 counts/(keV·kg·y), an unprecedented level for this technique. Thanks to this achievement, we set the most stringent lower limit on the 82Se 0νββ half-life. Moreover, we have developed a full background model, which allows us to identify the origin of the events in the region of interest. The reconstruction of the CUPID-0 spectrum has enabled us to perform the most precise measurement of the 2νββ of 82Se.