https://doi.org/10.1140/epjc/s10052-021-09476-z
Regular Article - Experimental Physics
Background identification in cryogenic calorimeters through 
delayed coincidences
1
INFN-Laboratori Nazionali di Legnaro, 35020, Legnaro, Padua, Italy
2
Materials Science Division, Lawrence Berkeley National Laboratory, 94720, Berkeley, CA, 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, 67100, 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
CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
12
IRFU, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
13
Department of Physics and Astronomy, University of South Carolina, 29208, Columbia, SC, USA
14
: Physics Department, University of California, 94720, Berkeley, CA, USA
15
: Fundación ARAID and Laboratorio de Física Nuclear y Astropartículas, Universidad de Zaragoza, 50009, Zaragoza, Spain
16
: Physics Department, Queen’s University, K7L 3N6, Kingston, ON, Canada
Received:
10
May
2021
Accepted:
22
July
2021
Published online:
10
August
2021
Localization and modeling of radioactive contaminations is a challenge that ultra-low background experiments are constantly facing. These are fundamental steps both to extract scientific results and to further reduce the background of the detectors. Here we present an innovative technique based on the analysis of delayed coincidences in 
Th and 
U decay chains, developed to investigate the contaminations of the ZnSe crystals in the CUPID-0 experiment. This method allows to disentangle surface and bulk contaminations of the detectors relying on the different probability to tag delayed coincidences as function of the 
decay position.
© The Author(s) 2021
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Funded by SCOAP3
