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Background identification in cryogenic calorimeters through α-α delayed coincidences

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arxiv 2105.04409 v2 pith:ERVY5EM7 submitted 2021-05-07 physics.ins-det nucl-exphysics.data-an

Background identification in cryogenic calorimeters through α-α delayed coincidences

classification physics.ins-det nucl-exphysics.data-an
keywords alphabackgroundcoincidencescontaminationsdelayedalpha-decaydetectors
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $\alpha-\alpha$ delayed coincidences in $^{232}$Th and $^{238}$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 $\alpha$ decay position.

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