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.
Pagnanini, L., Azzolini, O., Beeman, J., Bellini, F., Beretta, M., Biassoni, M., et al. (2019). Results on double beta decay of 82Se with CUPID-0 Phase i. Intervento presentato a: Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2019, Prague, Czech Republic [10.1063/1.5130980].
Results on double beta decay of 82Se with CUPID-0 Phase i
Pagnanini L.
;Beretta M.;Biassoni M.;Brofferio C.;Capelli S.;Carniti P.;Chiesa D.;Clemenza M.;Cremonesi O.;Gironi L.;Gotti C.;Nastasi M.;Pattavina L.;Pavan M.;Pessina G.;Pozzi S.;Previtali E.;Puiu A.;
2019
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.
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