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Measurement of the 2$\nu\beta\beta$ Decay Half-Life of Se-82 with the Global CUPID-0 Background Model

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arxiv 2306.14654 v2 pith:TCA45BTY submitted 2023-06-26 nucl-ex

classification nucl-ex
keywords backgroundbetadecaytextrmcupid-0datadoubleglobal
verification ladder T0 review T1 audit T2 compute T3 formal
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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$\times$yr of $^{82}$Se. We identify with improved precision the background sources within the 3 MeV energy region, where neutrinoless double $\beta$-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 $\beta$-decay half-life of $^{82}$Se with unprecedented accuracy: $T_{1/2}^{2\nu} = [8.69 \pm 0.05 \textrm{(stat.)}~^{+0.09}_{-0.06} \textrm{(syst.)}] \times 10^{19}~\textrm{yr}$.

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