First Results from CUORE: A Search for Lepton Number Violation via 0 nu ss ss Decay of Te-130

Anno: 2018

Autori: Alduino C., Alessandria F., Alfonso K., Andreotti E., Arnaboldi C., Avignone F.T., III Azzolini, O. Balata, M. Bandac, I. Banks, T.I. Bari, G. Barucci, M. Beeman, J.W. 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, X.G. 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, R.J. Cushman, J.S. D

Affiliazione autori: Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, United States; INFN, Sezione di Milano, I-Milano, I-20133, Italy; Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, United States; Dipartimento di Fisica e Matematica, Universita dell

Abstract: 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-number-violating process: Te-130 neutrinoless double-beta decay. Examining a total TeO2 exposure of 86.3 kg yr, characterized by an effective energy resolution of (7.7 +/- 0.5) keV FWHM and a background in the region of interest of (0.014 +/- 0.002) counts/(keV kg yr), we find no evidence for neutrinoless double-beta decay. Including systematic uncertainties, we place a lower limit on the decay half-life of T-1/2(0 nu) (Te-130) > 1.3 x 10(25) yr (90% C.L.); the median statistical sensitivity of this search is 7.0 x 10(24) yr. Combining this result with those of two earlier experiments, Cuoricino and CUORE-0, we find T-1/2(0 nu) (Te-130) > 1.5 x 10(25) yr (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 m(ss ss) < (110 - 520) meV, where the range reflects the nuclear matrix element estimates employed. Giornale/Rivista: PHYSICAL REVIEW LETTERS

Volume: 120 (13)      Da Pagina: 132501-1  A: 132501-8

Maggiori informazioni: The CUORE Collaboration thanks the directors and staff of the Laboratori Nazionali del Gran Sasso and our technical staff for their valuable contribution to building and operating the detector. We thank Danielle Speller for contributions to detector calibration, data analysis, and discussion of the manuscript. We thank Giorgio Frossati for his crucial support in the commissioning of the dilution unit. This work was supported by the Istituto Nazionale di Fisica Nucleare (INFN); the National Science Foundation under Grants No. NSF-PHY-0605119, No. NSF-PHY-0500337,
Parole chiavi: Image segmentation; Neutrons, Effective energy resolution; Lepton number violations; Majorana neutrino mass; Neutrinoless double-beta decays; Nuclear matrix elements; Region of interest; Statistical sensitivity; Systematic uncertainties, Tellurium compound
DOI: 10.1103/PhysRevLett.120.132501

Citazioni: 244
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