We present a new measurement of the 2νββ half-life of ^{130}Te (T_{1/2}^{2ν}) using the first complete model of the CUORE data, based on 1038 kg yr of collected exposure. Thanks to optimized data selection, we achieve a factor of two improvement in precision, obtaining T_{1/2}^{2ν}=(9.32 _{-0.04}^{+0.05}stat _{-0.07}^{+0.07}syst)×10^{20}  yr. The signal-to-background ratio is increased by 70% compared to our previous results, enabling the first application of the improved 2νββ formalism to ^{130}Te. Within this framework, we determine a credibility interval for the effective axial coupling in the nuclear medium as a function of nuclear matrix elements. We also extract values for the higher-order nuclear matrix element ratios: second-to-first and third-to-first. The second-to-first ratio agrees with nuclear model predictions, while the third-to-first ratio deviates from theoretical expectations. These findings provide essential tests of nuclear models and key inputs for future 0νββ searches.

Adams, D., Alduino, C., Alfonso, K., Armatol, A., Avignone, F., Azzolini, O., et al. (2025). Half-Life and Precision Shape Measurement of the 2νββ Decay of ^{130}Te. PHYSICAL REVIEW LETTERS, 135(8) [10.1103/jdhf-hn4l].

Half-Life and Precision Shape Measurement of the 2νββ Decay of ^{130}Te

Beretta, M.;Branca, A.;Brofferio, C.;Capelli, S.;Carniti, P.;Chiesa, D.;Dell'Oro, S.;Faverzani, M.;Fiorini, E.;Giachero, A.;Girola, M.;Gironi, L.;Nastasi, M.;Nucciotti, A.;Pattavina, L.;Pavan, M.;Pozzi, S.;Previtali, E.;Quitadamo, S.;
2025

Abstract

We present a new measurement of the 2νββ half-life of ^{130}Te (T_{1/2}^{2ν}) using the first complete model of the CUORE data, based on 1038 kg yr of collected exposure. Thanks to optimized data selection, we achieve a factor of two improvement in precision, obtaining T_{1/2}^{2ν}=(9.32 _{-0.04}^{+0.05}stat _{-0.07}^{+0.07}syst)×10^{20}  yr. The signal-to-background ratio is increased by 70% compared to our previous results, enabling the first application of the improved 2νββ formalism to ^{130}Te. Within this framework, we determine a credibility interval for the effective axial coupling in the nuclear medium as a function of nuclear matrix elements. We also extract values for the higher-order nuclear matrix element ratios: second-to-first and third-to-first. The second-to-first ratio agrees with nuclear model predictions, while the third-to-first ratio deviates from theoretical expectations. These findings provide essential tests of nuclear models and key inputs for future 0νββ searches.
Articolo in rivista - Articolo scientifico
Neutrinoless double beta decay; low temperature; rare events
English
22-ago-2025
2025
135
8
082501
none
Adams, D., Alduino, C., Alfonso, K., Armatol, A., Avignone, F., Azzolini, O., et al. (2025). Half-Life and Precision Shape Measurement of the 2νββ Decay of ^{130}Te. PHYSICAL REVIEW LETTERS, 135(8) [10.1103/jdhf-hn4l].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/572821
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