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    Half-Life and Precision Shape Measurement of the 2νββ Decay of Te130

    D. Q. Adams1, C. Alduino1, K. Alfonso2, A. Armatol3, F. T. Avignone, III1, O. Azzolini4, G. Bari5, F. Bellini6,7, G. Benato8,9 et al. (CUORE Collaboration)

    G. Benato8,9, M. Beretta10,11, M. Biassoni11, A. Branca10,11, C. Brofferio10,11, C. Bucci9, J. Camilleri2, A. Caminata12, A. Campani13,12, J. Cao14, C. Capelli3, S. Capelli10,11, L. Cappelli9, L. Cardani7, P. Carniti10,11, N. Casali7, E. Celi8,9, D. Chiesa10,11, M. Clemenza11, S. Copello15, O. Cremonesi11, R. J. Creswick1, A. D’Addabbo9, I. Dafinei7, S. Dell’Oro10,11, S. Di Domizio13,12, S. Di Lorenzo9, T. Dixon16, D. Q. Fang14, M. Faverzani10,11, E. Ferri11, F. Ferroni8,7, E. Fiorini10,11,*, M. A. Franceschi17, S. J. Freedman3,18,*, S. H. Fu9,14, B. K. Fujikawa3, S. Ghislandi8,9, A. Giachero10,11, M. Girola10,11, L. Gironi10,11, A. Giuliani16, P. Gorla9, C. Gotti11, P. V. Guillaumon9,†, T. D. Gutierrez19, K. Han20, E. V. Hansen18, K. M. Heeger21, D. L. Helis9, H. Z. Huang22, M. T. Hurst23, G. Keppel4, Yu. G. Kolomensky18,3, R. Kowalski24, R. Liu21, L. Ma14,22, Y. G. Ma14, L. Marini9, R. H. Maruyama21, D. Mayer18,3,25, Y. Mei3, M. N. Moore21, T. Napolitano17, M. Nastasi10,11, C. Nones26, E. B. Norman27, A. Nucciotti10,11, I. Nutini11, T. O’Donnell28, M. Olmi9, B. T. Oregui24, S. Pagan21, C. E. Pagliarone9,29, L. Pagnanini8,9, M. Pallavicini13,12, L. Pattavina10,11, M. Pavan10,11, G. Pessina11, V. Pettinacci7, C. Pira4, S. Pirro9, E. G. Pottebaum21, S. Pozzi11, E. Previtali10,11, A. Puiu9, S. Quitadamo8,9, A. Ressa7, C. Rosenfeld1, B. Schmidt26, R. Serino16,10, A. Shaikina8,9, V. Sharma23, V. Singh18, M. Sisti11, D. Speller24, P. T. Surukuchi23, L. Taffarello30, C. Tomei7, A. Torres2, J. A. Torres21, K. J. Vetter25,18,3, M. Vignati6,7, S. L. Wagaarachchi18,3, B. Welliver18,3, J. Wilson1, K. Wilson1, L. A. Winslow25, F. Xie14, T. Zhu18, S. Zimmermann31, S. Zucchelli32,5, D. Castillo33,34, J. Kotila35,36, J. Menéndez33,34, O. Niţescu36,37, and F. Šimkovic38,39 (CUORE Collaboration)

    • 1Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA
    • 2Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
    • 3Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
    • 4INFN—Laboratori Nazionali di Legnaro, Legnaro (Padova) I-35020, Italy
    • 5INFN—Sezione di Bologna, Bologna I-40127, Italy
    • 6Dipartimento di Fisica, Sapienza Università di Roma, Roma I-00185, Italy
    • 7INFN—Sezione di Roma, Roma I-00185, Italy
    • 8Gran Sasso Science Institute, L’Aquila I-67100, Italy
    • 9INFN—Laboratori Nazionali del Gran Sasso, Assergi (L’Aquila) I-67100, Italy
    • 10Dipartimento di Fisica, Università di Milano-Bicocca, Milano I-20126, Italy
    • 11INFN—Sezione di Milano Bicocca, Milano I-20126, Italy
    • 12INFN—Sezione di Genova, Genova I-16146, Italy
    • 13Dipartimento di Fisica, Università di Genova, Genova I-16146, Italy
    • 14Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China
    • 15INFN—Sezione di Pavia, Pavia I-27100, Italy
    • 16Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
    • 17INFN—Laboratori Nazionali di Frascati, Frascati (Roma) I-00044, Italy
    • 18Department of Physics, University of California, Berkeley, California 94720, USA
    • 19Physics Department, California Polytechnic State University, San Luis Obispo, California 93407, USA
    • 20INPAC and School of Physics and Astronomy, Shanghai Jiao Tong University; Shanghai Laboratory for Particle Physics and Cosmology, Shanghai 200240, China
    • 21Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
    • 22Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
    • 23Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
    • 24Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21211, USA
    • 25Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
    • 26IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
    • 27Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
    • 28Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061,USA
    • 29Dipartimento di Ingegneria Civile e Meccanica, Università degli Studi di Cassino e del Lazio Meridionale, Cassino I-03043, Italy
    • 30INFN—Sezione di Padova, Padova I-35131, Italy
    • 31Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
    • 32Dipartimento di Fisica e Astronomia, Alma Mater Studiorum—Università di Bologna, Bologna I-40127, Italy
    • 33Departament de Física Quàntica i Astrofísica, Universitat de Barcelona, 08028 Barcelona, Spain
    • 34Institut de Ciències del Cosmos, Universitat de Barcelona, 08028 Barcelona, Spain
    • 35Finnish Institute for Educational Research, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
    • 36International Centre for Advanced Training and Research in Physics (CIFRA), P.O. Box MG12, 077125 Bucharest-Magurele, Romania
    • 37“Horia Hulubei” National Institute of Physics and Nuclear Engineering, 30 Reactorului, P.O. Box MG6, 077125 Bucharest-Mágurele, Romania
    • 38Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, 842 48 Bratislava, Slovakia
    • 39Institute of Experimental and Applied Physics, Czech Technical University in Prague, 110 00 Prague, Czech Republic

    • *Deceased.
    • †Present address: Instituto de Física, Universidade de São Paulo, São Paulo 05508-090, Brazil.

    Phys. Rev. Lett. 135, 082501 – Published 22 August, 2025

    DOI: https://doi.org/10.1103/jdhf-hn4l

    Abstract

    We present a new measurement of the 2νββ half-life of Te130 (T1/22ν) 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 T1/22ν=(9.32 −0.04+0.05stat −0.07+0.07syst)×1020  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 Te130. 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.

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