Result on the Neutrinoless Double Beta Decay Search of 82Se with the CUPID-0 Experiment

• Main Authors: Fabio Bellini, Oscar Azzolini, Maria Teresa Barrera, Jeffrey Beeman, Mattia Beretta, Matteo Biassoni, Chiara Brofferio, Carlo Bucci, Lucia Canonica, Silvia Capelli, Laura Cardani, Paolo Carniti, Nicola Casali, Lorenzo Cassina, Massimiliano Clemenza, Oliverio Cremonesi, Angelo Cruciani, Antonio D’Addabbo, Ioan Dafinei, Sergio Di Domizio, Fernando Ferroni, Luca Gironi, Andrea Giuliani, Paolo Gorla, Claudio Gotti, Giorgio Keppel, Maria Martinez, Silvio Morganti, Sergei Nagorny, Massimiliano Nastasi, Stefano Nisi, Claudia Nones, Donato Orlandi, Lorenzo Pagnanini, Marco Pallavicini, Vincenzo Palmieri, Luca Pattavina, Maura Pavan, Gianluigi Pessina, Valerio Pettinacci, Stefano Pirro, Stefano Pozzi, Ezio Previtali, Andrei Puiu, Claudia Rusconi, Karoline Schäffner, Claudia Tomei, Marco Vignati, Anastasia Zolotarova
• Format: Article
• Language: English
• Published: MDPI AG 2018-12-01
• Series: Universe
• Subjects: neutrinoless double beta decay; Zn82Se scintillating cryogenic calorimeters; Majorana neutrino
• Online Access: http://www.mdpi.com/2218-1997/5/1/2

CUPID-0 is the first large array of scintillating Zn 82 Se cryogenic calorimeters (bolometers) implementing particle identification for the search of the neutrinoless double beta decay (0 ν β β ). The detector consists of 24 enriched Zn 82 Se bolometers for a total 82 Se mass of 5.28 kg and it has been taking data in the underground LNGS (Italy) since March 2017. In this article we show how the dual read-out provides a powerful tool for the α particles rejection. The simultaneous use of the heat and light information allows us to reduce the background down to (3.2 − 1.1 + 1.3 )×10 − 3 counts/(keV kg year), an unprecedented level for cryogenic calorimeters. In a total exposure of 5.46 kg year Zn 82 Se we set the most stringent limit on the 0 ν β β decay 82 Se half-life T 1 / 2 0 ν > 4.0 × 10 24 year at 90% C.I.