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 yr. 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 yr)) 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.
@article{arxiv.1904.10397,
title = {Background Model of the CUPID-0 Experiment},
author = {O. Azzolini and J. W. Beeman and F. Bellini and M. Beretta and M. Biassoni and C. Brofferio and C. Bucci and S. Capelli and L. Cardani and P. Carniti and N. Casali and D. Chiesa and M. Clemenza and O. Cremonesi and A. Cruciani and I. Dafinei and S. Di Domizio and F. Ferroni and L. Gironi and A. Giuliani and P. Gorla and C. Gotti and G. Keppel and M. Martinez and S. Nagorny and M. Nastasi and S. Nisi and C. Nones and D. Orlandi and L. Pagnanini and M. Pallavicini and L. Pattavina and M. Pavan and G. Pessina and V. Pettinacci and S. Pirro and S. Pozzi and E. Previtali and A. Puiu and C. Rusconi and K. Schäffner and C. Tomei and M. Vignati and A. Zolotarova},
journal= {arXiv preprint arXiv:1904.10397},
year = {2019}
}
Comments
This is a post-peer-review, pre-copyedit version of an article published in Eur. Phys. J. C. The final authenticated version is available online at: https://doi.org/10.1140/epjc/s10052-019-7078-8