利用全球CUPID-0本底模型测量\(^{82}Se\)的双中微子双β衰变半衰期

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

作者信息

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

机构信息

INFN Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padua), Italy.

Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

出版信息

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

DOI:10.1103/PhysRevLett.131.222501

PMID:38101385

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.

摘要

我们报告了使用全球CUPID - 0背景模型所获得的结果，该模型结合了两次测量活动中收集的数据，总曝光量为8.82 kg×年的⁸²Se。我们以更高的精度识别了3 MeV能量区域内的背景源，该区域预计会发生⁸²Se和¹⁰⁰Mo的无中微子双β衰变，从而为下一代CUPID实验的背景预算奠定了更坚实的基础。依靠出色的数据重建，我们以前所未有的精度测量了⁸²Se的双中微子双β衰变半衰期：T₁/₂²ν = [8.69±0.05(统计)_ - 0.06⁺⁰.⁰⁹(系统)]×10¹⁹年。