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. 2023 Dec 1;131(22):222501.
doi: 10.1103/PhysRevLett.131.222501.

Measurement of the 2νββ Decay Half-Life of ^{82}Se with the Global CUPID-0 Background Model

O Azzolini  1 , J W Beeman  2 , F Bellini  3   4 , M Beretta  5   6 , M Biassoni  6 , C Brofferio  5   6 , C Bucci  7 , S Capelli  5   6 , V Caracciolo  7 , L Cardani  4 , P Carniti  5   6 , N Casali  4 , E Celi  7   8 , D Chiesa  5   6 , M Clemenza  5   6 , I Colantoni  4   9 , O Cremonesi  6 , A Cruciani  4 , A D'Addabbo  7 , I Dafinei  4   8 , S Di Domizio  10   11 , V Dompè  3   4 , G Fantini  3   4 , F Ferroni  4   8 , L Gironi  5   6 , A Giuliani  12 , P Gorla  7 , C Gotti  6 , G Keppel  1 , J Kotila  13   14   15 , M Martinez  3   4 , S S Nagorny  7 , M Nastasi  5   6 , S Nisi  7 , C Nones  16 , D Orlandi  7 , L Pagnanini  7   8 , M Pallavicini  10   11 , L Pattavina  7 , M Pavan  5   6 , G Pessina  6 , V Pettinacci  4 , S Pirro  7 , S Pozzi  5   6 , E Previtali  5   7 , A Puiu  7 , A Ressa  3   4 , C Rusconi  7   17 , K Schäffner  7 , C Tomei  4 , M Vignati  3   4 , A S Zolotarova  16
Affiliations

Measurement of the 2νββ Decay Half-Life of ^{82}Se with the Global CUPID-0 Background Model

O Azzolini et al. Phys Rev Lett. .

Abstract

We report on the results obtained with the global CUPID-0 background model, which combines the data collected in the two measurement campaigns for a total exposure of 8.82 kg×yr of ^{82}Se. We identify with improved precision the background sources within the 3 MeV energy region, where neutrinoless double β decay of ^{82}Se and ^{100}Mo is expected, making more solid the foundations for the background budget of the next-generation CUPID experiment. Relying on the excellent data reconstruction, we measure the two-neutrino double β-decay half-life of ^{82}Se with unprecedented accuracy: T_{1/2}^{2ν}=[8.69±0.05(stat)_{-0.06}^{+0.09}(syst)]×10^{19} yr.

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