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

2023/06/26 by Azzolini, O., Beeman, J. W., Bellini, F. +49
#FOS: Physical sciences #Nuclear Experiment (nucl-ex)

paper · doi:10.48550/arxiv.2306.14654

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 ⁸²Se. We identify with improved precision the background sources within the 3 MeV energy region, where neutrinoless double β-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 β-decay half-life of ⁸²Se with unprecedented accuracy: T_1/2^2ν = [8.69 ± 0.05 \textrm(stat.)~^+0.09_-0.06 \textrm(syst.)] × 10¹⁹~\textrmyr.

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