Improved Limit on Neutrinoless Double-Beta Decay in $^{130}$Te with CUORE

D.Q. Adams , C. Alduino , K. Alfonso , F.T. Avignone , O. Azzolini , G. Bari , F. Bellini , G. Benato , M. Biassoni , A. Branca , C. Brofferio , C. Bucci , A. Caminata , A. Campani , L. Canonica , X.G. Cao , S. Capelli , L. Cappelli , L. Cardani , P. Carniti , N. Casali , D. Chiesa , N. Chott , M. Clemenza , S. Copello , C. Cosmelli , O. Cremonesi , R.J. Creswick , A. d'Addabbo , D. d'Aguanno , I. Dafinei , C.J. Davis , S. Dell'Oro , S. Di Domizio , V. Dompè , D.Q. Fang , G. Fantini , M. Faverzani , E. Ferri , F. Ferroni , E. Fiorini , M.A. Franceschi , S.J. Freedman , B.K. Fujikawa , A. Giachero , L. Gironi , A. Giuliani (1) , P. Gorla , C. Gotti , T.D. Gutierrez , K. Han , K.M. Heeger , R.G. Huang , H.Z. Huang , J. Johnston , G. Keppel , Yu.G. Kolomensky , C. Ligi , Y.G. Ma , L. Ma , L. Marini , R.H. Maruyama , Y. Mei , N. Moggi , S. Morganti , T. Napolitano , M. Nastasi , J. Nikkel , C. Nones (2) , E.B. Norman , V. Novati (1) , A. Nucciotti , I. Nutini , T. O'Donnell , J.L. Ouellet , C.E. Pagliarone , L. Pagnanini , M. Pallavicini , L. Pattavina , M. Pavan , G. Pessina , V. Pettinacci , C. Pira , S. Pirro , S. Pozzi , E. Previtali , A. Puiu , C. Rosenfeld , C. Rusconi , M. Sakai , S. Sangiorgio , B. Schmidt , N.D. Scielzo , V. Sharma , V. Singh , M. Sisti , D. Speller , L. Taffarello , F. Terranova , C. Tomei , M. Vignati , S.L. Wagaarachchi , B.S. Wang , B. Welliver , J. Wilson , K. Wilson , L.A. Winslow , L. Zanotti , S. Zimmermann , S. Zucchelli

1 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
2 DPhP - Département de Physique des Particules (ex SPP)

We report new results from the search for neutrinoless double-beta decay in  Te130 with the CUORE detector. This search benefits from a fourfold increase in exposure, lower trigger thresholds, and analysis improvements relative to our previous results. We observe a background of (1.38±0.07)×10-2  counts/(keV kg yr)) in the 0νββ decay region of interest and, with a total exposure of 372.5 kg yr, we attain a median exclusion sensitivity of 1.7×1025  yr. We find no evidence for 0νββ decay and set a 90% credibility interval Bayesian lower limit of 3.2×1025  yr on the  Te130 half-life for this process. In the hypothesis that 0νββ decay is mediated by light Majorana neutrinos, this results in an upper limit on the effective Majorana mass of 75–350 meV, depending on the nuclear matrix elements used.

Mots clés: Nuclear Physics; double-beta decay: (0neutrino); neutrino: Majorana; trigger: threshold; energy: threshold; mass: Majorana; CUORE; sensitivity; semileptonic decay; background; Bayesian; nucleus; S076H0N; S076MW

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

D.Q. Adams, C. Alduino, K. Alfonso, F.T. Avignone, O. Azzolini, et al.. Improved Limit on Neutrinoless Double-Beta Decay in $^{130}$Te with CUORE. Phys.Rev.Lett., 2020, 124 (12), pp.122501. ⟨10.1103/PhysRevLett.124.122501⟩. ⟨hal-02447833⟩