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  • Search for double-beta deca...
    D. Q. Adams; C. Alduino; K. Alfonso; F. T. III Avignone; O. Azzolini; G. Bari; F. Bellini; G. Benato; A. Branca; C. Brofferio; C. Bucci; J. Camilleri; A. Caminata; A. Campani; L. Canonica; X. G. Cao; S. Capelli; L. Cappelli; L. Cardani; P. Carniti; N. Casali; E. Celi; D. Chiesa; M. Clemenza; S. Copello; C. Cosmelli; O. Cremonesi; R. J. Creswick; A. D’Addabbo; I. Dafinei; C. J. Davis; S. Dell’Oro; V. Dompè; G. Fantini; M. Faverzani; E. Ferri; F. Ferroni; M. A. Franceschi; S. J. Freedman; S. H. Fu; B. K. Fujikawa; A. Giachero; L. Gironi; A. Giuliani; P. Gorla; C. Gotti; T. D. Gutierrez; K. M. Heeger; R. G. Huang; H. Z. Huang; J. Johnston; C. Ligi; L. Ma; Y. G. Ma; L. Marini; R. H. Maruyama; D. Mayer; Y. Mei; N. Moggi; S. Morganti; J. Nikkel; C. Nones; E. B. Norman; A. Nucciotti; T. O’Donnell; J. L. Ouellet; S. Pagan; C. E. Pagliarone; L. Pagnanini; L. Pattavina; M. Pavan; G. Pessina; V. Pettinacci; C. Pira; S. Pirro; S. Pozzi; E. Previtali; 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; K. J. Vetter; M. Vignati; S. L. Wagaarachchi; B. S. Wang; B. Welliver; J. Wilson; K. Wilson; L. A. Winslow; S. Zimmermann; S. Zucchelli

    The European physical journal. C, Particles and fields, 07/2021, Letnik: 81, Številka: 7
    Journal Article

    Abstract The CUORE experiment is a large bolometric array searching for the lepton number violating neutrino-less double beta decay ( $$0\nu \beta \beta $$ 0 ν β β ) in the isotope $$\mathrm {^{130}Te}$$ 130 Te . In this work we present the latest results on two searches for the double beta decay (DBD) of $$\mathrm {^{130}Te}$$ 130 Te to the first $$0^{+}_2$$ 0 2 + excited state of $$\mathrm {^{130}Xe}$$ 130 Xe : the $$0\nu \beta \beta $$ 0 ν β β decay and the Standard Model-allowed two-neutrinos double beta decay ( $$2\nu \beta \beta $$ 2 ν β β ). Both searches are based on a 372.5 kg $$\times $$ × yr TeO $$_2$$ 2 exposure. The de-excitation gamma rays emitted by the excited Xe nucleus in the final state yield a unique signature, which can be searched for with low background by studying coincident events in two or more bolometers. The closely packed arrangement of the CUORE crystals constitutes a significant advantage in this regard. The median limit setting sensitivities at 90% Credible Interval (C.I.) of the given searches were estimated as $$\mathrm {S^{0\nu }_{1/2} = 5.6 \times 10^{24} \, \mathrm {yr}}$$ S 1 / 2 0 ν = 5.6 × 10 24 yr for the $${0\nu \beta \beta }$$ 0 ν β β decay and $$\mathrm {S^{2\nu }_{1/2} = 2.1 \times 10^{24} \, \mathrm {yr}}$$ S 1 / 2 2 ν = 2.1 × 10 24 yr for the $${2\nu \beta \beta }$$ 2 ν β β decay. No significant evidence for either of the decay modes was observed and a Bayesian lower bound at $$90\%$$ 90 % C.I. on the decay half lives is obtained as: $$\mathrm {(T_{1/2})^{0\nu }_{0^+_2} > 5.9 \times 10^{24} \, \mathrm {yr}}$$ ( T 1 / 2 ) 0 2 + 0 ν > 5.9 × 10 24 yr for the $$0\nu \beta \beta $$ 0 ν β β mode and $$\mathrm {(T_{1/2})^{2\nu }_{0^+_2} > 1.3 \times 10^{24} \, \mathrm {yr}}$$ ( T 1 / 2 ) 0 2 + 2 ν > 1.3 × 10 24 yr for the $$2\nu \beta \beta $$ 2 ν β β mode. These represent the most stringent limits on the DBD of $$^{130}$$ 130 Te to excited states and improve by a factor $$\sim 5$$ ∼ 5 the previous results on this process.