CUPID-0 is the first large mass array of enriched Zn82Se scintillating low temperature calorimeters, operated at LNGS since 2017. During its first scientific runs, CUPID-0 collected an exposure of 9.95 kg year. Thanks to the excellent rejection of α particles, we attained the lowest background ever measured with thermal detectors in the energy region where we search for the signature of 82Se neutrinoless double beta decay. In this work we develop a model to reconstruct the CUPID-0 background over the whole energy range of experimental data. We identify the background sources exploiting their distinctive signatures and we assess their extremely low contribution [down to ∼ 10 - 4 counts/(keV kg year)] in the region of interest for 82Se neutrinoless double beta decay search. This result represents a crucial step towards the comprehension of the background in experiments based on scintillating calorimeters and in next generation projects such as CUPID.
Background model of the CUPID-0 experiment / 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.; Domizio, S. D.; Ferroni, F.; Gironi, L.; Giuliani, A.; Gorla, P.; Gotti, C.; Keppel, G.; Martinez, M.; 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.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 79:7(2019). [10.1140/epjc/s10052-019-7078-8]
Background model of the CUPID-0 experiment
Bellini F.;Cardani L.;Casali N.;Cruciani A.;Dafinei I.;Ferroni F.;Pettinacci V.;Vignati M.;
2019
Abstract
CUPID-0 is the first large mass array of enriched Zn82Se scintillating low temperature calorimeters, operated at LNGS since 2017. During its first scientific runs, CUPID-0 collected an exposure of 9.95 kg year. Thanks to the excellent rejection of α particles, we attained the lowest background ever measured with thermal detectors in the energy region where we search for the signature of 82Se neutrinoless double beta decay. In this work we develop a model to reconstruct the CUPID-0 background over the whole energy range of experimental data. We identify the background sources exploiting their distinctive signatures and we assess their extremely low contribution [down to ∼ 10 - 4 counts/(keV kg year)] in the region of interest for 82Se neutrinoless double beta decay search. This result represents a crucial step towards the comprehension of the background in experiments based on scintillating calorimeters and in next generation projects such as CUPID.| File | Dimensione | Formato | |
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