Search for neutrinoless double beta decay of $$^{64}$$64 Zn and $$^{70}$$70 Zn with CUPID-0
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Regular Article - Experimental Physics
Search for neutrinoless double beta decay of 64 Zn and 70 Zn with CUPID-0 O. Azzolini1, J. W. Beeman2 , F. Bellini3,4 , M. Beretta5,6 , M. Biassoni6 , C. Brofferio5,6 , C. Bucci7 , S. Capelli5,6 , L. Cardani4,a , E. Celi7,8 , P. Carniti5,6 , N. Casali4 , D. Chiesa5,6 , M. Clemenza5,6 , O. Cremonesi6 , A. Cruciani4 , A. D’Addabbo7,8 , I. Dafinei4 , S. Di Domizio9,10 , F. Ferroni4,8 , L. Gironi5,6 , A. Giuliani11 , P. Gorla7 , C. Gotti5,6 , G. Keppel1, M. Martinez3,4,14 , S. Nagorny7,8,15 , M. Nastasi5,6 , S. Nisi7 , C. Nones12 , D. Orlandi7 , L. Pagnanini5,6 , M. Pallavicini9,10 , L. Pattavina7,8,16 , M. Pavan5,6 , G. Pessina6 , V. Pettinacci3,4 , S. Pirro7 , S. Pozzi5,6 , E. Previtali5,6 , A. Puiu7,8 , C. Rusconi7,13 , K. Schäffner7,8,17 , C. Tomei4 , M. Vignati3,4 , A. Zolotarova11 1
INFN-Laboratori Nazionali di Legnaro, 35020 Legnaro, Padua, Italy Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA 3 Dipartimento di Fisica, Sapienza Università di Roma, 00185 Rome, Italy 4 INFN-Sezione di Roma, 00185 Rome, Italy 5 Dipartimento di Fisica, Università di Milano-Bicocca, 20126 Milan, Italy 6 INFN-Sezione di Milano-Bicocca, 20126 Milan, Italy 7 INFN-Laboratori Nazionali del Gran Sasso, Assergi, 67010 L’Aquila, Italy 8 Gran Sasso Science Institute, 67100 L’Aquila, Italy 9 Dipartimento di Fisica, Università di Genova, 16146 Genoa, Italy 10 INFN-Sezione di Genova, 16146 Genoa, Italy 11 Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France 12 IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France 13 Department of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, USA 14 Present address: Fundacion ARAID and Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Saragoza, Spain 15 Present address: Queen’s University, Kingston, ON K7L 3N6, Canada 16 Present address: Physik Department, Technische Universität München, 85748 Garching, Germany 17 Present address: Max-Planck-Institut für Physik, 80805 Munich, Germany 2
Received: 22 March 2020 / Accepted: 23 July 2020 © The Author(s) 2020
Abstract CUPID-0 is the first pilot experiment of CUPID, a next-generation project searching for neutrinoless double beta decay. In its first scientific run, CUPID-0 operated 26 ZnSe cryogenic calorimeters coupled to light detectors in the underground Laboratori Nazionali del Gran Sasso. In this work, we analyzed a ZnSe exposure of 11.34 kg year to search for the neutrinoless double beta decay of 70 Zn and for the neutrinoless positron-emitting electron capture of 64 Zn. We found no evidence for these decays and set 90% 0νββ credible interval limits of T1/2 (70 Zn) > 1.6 1021 year and 0ν ECβ+
(64 Zn) > 1.2×1022 year, surpassing by more than T1/2 one order of magnitude the previous experimental results (Belli et al. in J Phys G 38(11):115107, https://doi.org/10. 1088/0954-3899/38/11/115107, 2011).
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1 Introduction Double beta decay is among the rarest processes in nature. This transition, where a nucleus changes its at
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