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First results from CUORE: A search for lepton number violation via 0νββ decay of130Te

  • Author(s): Alduino, C
  • Alessandria, F
  • Alfonso, K
  • Andreotti, E
  • Arnaboldi, C
  • Avignone, FT
  • Azzolini, O
  • Balata, M
  • Bandac, I
  • Banks, TI
  • Bari, G
  • Barucci, M
  • Beeman, JW
  • Bellini, F
  • Benato, G
  • Bersani, A
  • Biare, D
  • Biassoni, M
  • Bragazzi, F
  • Branca, A
  • Brofferio, C
  • Bryant, A
  • Buccheri, A
  • Bucci, C
  • Bulfon, C
  • Camacho, A
  • Caminata, A
  • Canonica, L
  • Cao, XG
  • Capelli, S
  • Capodiferro, M
  • Cappelli, L
  • Cardani, L
  • Cariello, M
  • Carniti, P
  • Carrettoni, M
  • Casali, N
  • Cassina, L
  • Cereseto, R
  • Ceruti, G
  • Chiarini, A
  • Chiesa, D
  • Chott, N
  • Clemenza, M
  • Conventi, D
  • Copello, S
  • Cosmelli, C
  • Cremonesi, O
  • Crescentini, C
  • Creswick, RJ
  • Cushman, JS
  • D'Addabbo, A
  • D'Aguanno, D
  • Dafinei, I
  • Datskov, V
  • Davis, CJ
  • Del Corso, F
  • Dell'Oro, S
  • Deninno, MM
  • Di Domizio, S
  • Di Vacri, ML
  • Di Paolo, L
  • Drobizhev, A
  • Ejzak, L
  • Faccini, R
  • Fang, DQ
  • Faverzani, M
  • Ferri, E
  • Ferroni, F
  • et al.
Abstract

© 2018 American Physical Society. The CUORE experiment, a ton-scale cryogenic bolometer array, recently began operation at the Laboratori Nazionali del Gran Sasso in Italy. The array represents a significant advancement in this technology, and in this work we apply it for the first time to a high-sensitivity search for a lepton-numberviolating process:130Te neutrinoless double-beta decay. Examining a total TeO2 exposure of 86.3 kg yr, characterized by an effective energy resolution of d7.7 ± 0.5T keV FWHM and a background in the region of interest of d0.014 ± 0.002T counts=dkeV kg yrT, we find no evidence for neutrinoless double-beta decay. Including systematic uncertainties, we place a lower limit on the decay half-life of T0ν1/2(130Te) > 1.3 × 1025yr (90% C.L.); the median statistical sensitivity of this search is 7.0 × 1024yr. Combining this result with those of two earlier experiments, Cuoricino and CUORE-0, we find T0ν1/2(130Te) > 1.5 × 1025yr (90% C.L.), which is the most stringent limit to date on this decay. Interpreting this result as a limit on the effective Majorana neutrino mass, we find mββ< (110 - 520) meV, where the range reflects the nuclear matrix element estimates employed.

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