Measurement of the 2nuββ Decay Half-Life of 82Se with the Global CUPID-0 Background Model

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 x yr of 82Se. We identify with improved precision the background sources within the 3 MeV energy region, where neutrinoless double beta decay of 82Se and 100Mo 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 beta-decay half-life of 82Se with unprecedented accuracy: T2 nu 1/2 = [8.69 +/- 0.05(stat) thorn 0.09 -0.06(syst)] x 1019 yr.