Novel technique for the study of pile-up events in cryogenic bolometers

Abstract

Precise characterization of detector time resolution is of crucial importance for next-generation cryogenic-bolometer experiments searching for neutrinoless double-beta decay, such as CUPID, in order to reject background due to pile-up of two-neutrino double-beta decay events. In this paper, we describe a technique developed to study the pile-up rejection capability of cryogenic bolometers. Our approach, which consists of producing controlled pile-up events with a programmable waveform generator, has the benefit that we can reliably and reproducibly control the time separation and relative energy of the individual components of the generated pile-up events. The resulting data allow us to optimize and benchmark analysis strategies to discriminate between individual and pile-up pulses. We describe a test of this technique performed with a small array of detectors at the Laboratori Nazionali del Gran Sasso, in Italy; we obtain a 90% rejection efficiency against pulser-generated pile-up events with rise time of ~15ms down to time separation between the individual events of about 2ms.

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Cited by in corpus (10)

• CUPID, the CUORE Upgrade with Particle IDentification
• The background model of the CUPID-Mo $0\nu \beta \beta$ experiment
• Test of ${}^{116}$CdWO${}_4$ and Li${}_2$MoO${}_4$ scintillating bolometers in the CROSS underground facility with upgraded detector suspension
• Twelve-crystal prototype of Li${}_2$MoO${}_4$ scintillating bolometers for CUPID and CROSS experiments
• Array of Cryogenic Calorimeters to Evaluate the Spectral Shape of forbidden $\beta$-decays: the ACCESS project
• Li${}_2$${}^{100\text{depl}}$MoO${}_4$ Scintillating Bolometers for Rare-Event Search Experiments
• BINGO innovative assembly for background reduction in bolometric $0\nu \beta \beta$ experiments
• First demonstration of a TES based cryogenic Li${}_2$MoO${}_4$detector for neutrinoless double beta decay search
• Estimation of waveform deformation with the matched filter
• Cryogenic light detectors with thermal signal amplification for $0\nu \beta \beta$ search experiments