CUPID-0 is the first large array of enriched scintillating ZnSe cryogenic calorimeters implementing active particle identification. The detector consists of an array of 24 ZnSe crystals 95% enriched in 82Se and two natural ZnSe crystals for a total mass of 10.5 kg. We report the first result of the search for neutrinoless double beta decay (0νDBD) in 82Se based on the data collected between June and November 2017. We find no evidence in a 1.83 kg·yr 82Se exposure and we set the most stringent lower limit on the 0νDBD 82Se half life of T01ν/2 > 2.4 · 1024yr (90% C.I.) which corresponds to an effective Majorana neutrino mass mββ < (376-770) meV. This excellent result was obtained also thanks to the heat-light readout that provides a unique tool for α particle discrimination and allows to suppress the background in the region of interest to an unprecedented level for a bolometric experiment.
Gironi, L. (2018). Results of Cupid-0. In Proceedings of the 53rd Rencontres de Moriond - 2018 Electroweak Interactions and Unified Theories, EW 2018 (pp.333-338). ARISF.
Results of Cupid-0
Gironi L.
2018
Abstract
CUPID-0 is the first large array of enriched scintillating ZnSe cryogenic calorimeters implementing active particle identification. The detector consists of an array of 24 ZnSe crystals 95% enriched in 82Se and two natural ZnSe crystals for a total mass of 10.5 kg. We report the first result of the search for neutrinoless double beta decay (0νDBD) in 82Se based on the data collected between June and November 2017. We find no evidence in a 1.83 kg·yr 82Se exposure and we set the most stringent lower limit on the 0νDBD 82Se half life of T01ν/2 > 2.4 · 1024yr (90% C.I.) which corresponds to an effective Majorana neutrino mass mββ < (376-770) meV. This excellent result was obtained also thanks to the heat-light readout that provides a unique tool for α particle discrimination and allows to suppress the background in the region of interest to an unprecedented level for a bolometric experiment.
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