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arxiv: 2503.24137 · v1 · pith:FEP6GJKRnew · submitted 2025-03-31 · ⚛️ nucl-ex

Half-life and precision shape measurement of 2{ν}{β}{β} decay of ¹³⁰Te

D. Q. Adams , C. Alduino , K. Alfonso , F. T. Avignone III , O. Azzolini , G. Bari , F. Bellini , G. Benato
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M. Beretta M. Biassoni A. Branca C. Brofferio C. Bucci J. Camilleri A. Caminata A. Campani J. Cao C. Capelli S. Capelli L. Cappelli L. Cardani P. Carniti N. Casali E. Celi D. Chiesa M. Clemenza S. Copello O. Cremonesi R. J. Creswick A. D'Addabbo I. Dafinei S. Dell'Oro S. Di Domizio S. Di Lorenzo T. Dixon D. Q. Fang G. Fantini M. Faverzani E. Ferri F. Ferroni E. Fiorini M. A. Franceschi S. J. Freedman S.H. Fu B. K. Fujikawa S. Ghislandi A. Giachero M. Girola L. Gironi A. Giuliani P. Gorla C. Gotti P.V. Guillaumon T. D. Gutierrez K. Han E. V. Hansen K. M. Heeger D.L. Helis H. Z. Huang G. Keppel Yu. G. Kolomensky R. Kowalski R. Liu L. Ma Y. G. Ma L. Marini R. H. Maruyama D. Mayer Y. Mei M. N. Moore T. Napolitano M. Nastasi C. Nones E. B. Norman A. Nucciotti I. Nutini T. O'Donnell M. Olmi B.T. Oregui S. Pagan C. E. Pagliarone L. Pagnanini M. Pallavicini L. Pattavina M. Pavan G. Pessina V. Pettinacci C. Pira S. Pirro E. G. Pottebaum S. Pozzi E. Previtali A. Puiu S. Quitadamo A. Ressa C. Rosenfeld B. Schmidt A. Shaikina V. Sharma V. Singh M. Sisti D. Speller P.T. Surukuchi L. Taffarello C. Tomei A. Torres J.A. Torres K. J. Vetter M. Vignati S. L. Wagaarachchi B. Welliver K. Wilson J. Wilson L. A. Winslow F. Xie T. Zhu S. Zimmermann S. Zucchelli (CUORE Collaboration) D. Castillo J. Kotila J. Menendez. O. Nitescu F. Simkovic
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We present a new measurement of the 2nbb half-life of 130Te (T1/2) 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 T1/2 = (9.32 +0.05 -0.04 (stat.) +0.07 -0.07 (syst.)) x10^20 yr. The signal-to-background ratio is increased by 70% compared to our previous results, enabling the first application of the improved 2nbb formalism to 130Te. 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 0nbb searches.

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