Final Result of CUPID-0 Phase-I in the Search for the Se-82 Neutrinoless Double-beta Decay

Azzolini, O. ; Beeman, J.W. ; Bellini, F. ; Beretta, M. ; Biassoni, M. ; Brofferio, C. ; Bucci, C. ; Capelli, S. ; Cardani, L. ; Carniti, P. ; Casali, N. ; Chiesa, D. ; Clemenza, M. ; Cremonesi, O. ; Cruciani, A. ; Dafinei, I. ; Di Domizio, S. ; Ferroni, F. ; Gironi, L. ; Giuliani, A. ; Gorla, P. ; Gotti, C. ; Keppel, G. ; Martinez, M. (Universidad de Zaragoza) ; Nagorny, S. ; Nastasi, M. ; Nisi, S. ; Nones, C. ; Orlandi, D. ; Pagnanini, L. ; Pallavicini, M. ; Pattavina, L. ; Pavan, M. ; Pessina, G. ; Pettinacci, V. ; Pirro, S. ; Pozzi, S. ; Previtali, E. ; Puiu, A. ; Rusconi, C. ; Schaffner, K. ; Tomei, C. ; Vignati, M. ; Zolotarova, A.S.

Resumen: CUPID-0 is the first pilot experiment of CUPID, a next-generation project for the measurement of neutrinoless double beta decay (0νDBD) with scintillating bolometers. The detector, consisting of 24 enriched and 2 natural ZnSe crystals, has been taking data at Laboratori Nazionali del Gran Sasso from June 2017 to December 2018, collecting a 82Se exposure of 5.29  kg×yr. In this Letter we present the phase-I results in the search for 0νDBD. We demonstrate that the technology implemented by CUPID-0 allows us to reach the lowest background for calorimetric experiments: (3.5+1.0−0.9)×10−3  counts/(keV kg yr). Monitoring 3.88×1025 82Se nuclei×yr we reach a 90% credible interval median sensitivity of T0ν1/2>5.0×1024  yr and set the most stringent limit on the half-life of 82Se 0νDBD: T0ν1/2>3.5×1024  yr (90% credible interval), corresponding to mββ<(311–638)  meV depending on the nuclear matrix element calculations

Idioma: Inglés

DOI: 10.1103/PhysRevLett.123.032501

Año: 2019

Publicado en: Physical Review Letters 123, 3 (2019), 032501 [6 pp]
ISSN: 0031-9007

Factor impacto JCR: 8.385 (2019)

Categ. JCR: PHYSICS, MULTIDISCIPLINARY rank: 6 / 85 = 0.071 (2019) - Q1 - T1

Factor impacto SCIMAGO: 3.588 - Physics and Astronomy (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/EC/FP7/247115/EU/Low-background Underground Cryogenic Installation For Elusive Rates/LUCIFER

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Atóm.Molec.y Nucl. (Dpto. Física Teórica)