Analysis of cryogenic calorimeters with light and heat read-out for double beta decay searches

Abstract

The suppression of spurious events in the region of interest for neutrinoless double beta decay will play a major role in next generation experiments. The background of detectors based on the technology of cryogenic calorimeters is expected to be dominated by particles, that could be disentangled from double beta decay signals by exploiting the difference in the emission of the scintillation light. CUPID-0, an array of enriched ZnSe scintillating calorimeters, is the first large mass demonstrator of this technology. The detector started data-taking in 2017 at the Laboratori Nazionali del Gran Sasso with the aim of proving that dual read-out of light and heat allows for an efficient suppression of the background. In this paper we describe the software tools we developed for the analysis of scintillating calorimeters and we demonstrate that this technology allows to reach an unprecedented background for cryogenic calorimeters.

The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects

“…The NTDs were glued on the Li 2 100 MoO 4 crystals using the dedicated tool shown in Fig. 2, similar to the one used by CUPID-0 [25]. The glue is a two-component epoxy resin (Araldite R Rapid) well-tested for cryogenic applications and demonstrated to have acceptable radiopurity [20].…”

“…Two independent analysis frameworks, both exploiting the optimum filter technique [44], are used for the data processing: one, called DIANA [45,? ], is adapted from the CUORE [14] and CUPID-0 [46] experiments and the other was developed at CSNSM [47] and used for the analysis of the LU-MINEU data [28]. The CSNSM code has been developed (using the MATLAB MULTI Integrated Development Environment) specifically for the analysis of scintillating bolometer data.…”

“…The dual readout concept, where both the heat and light signals are recorded, has been implemented in two mediumscale CUPID demonstrators: CUPID-0, taking data at LNGS since 2017, and CUPID-Mo, which started the physics datataking at the beginning of 2019 in the Laboratoire Souterrain de Modane (LSM, France). Following the CUPID strategy, both experiments make use of enriched crystals (24 Zn 82 Se crystals for CUPID-0 [25] and 20 Li 2 100 MoO 4 crystals for CUPID-Mo) to search for 0νβ β decay.…”

Production and characterisation of a $$\hbox {PbMoO}_4$$ cryogenic detector from archaeological Pb

“…For more details on the operating condition of the LD refer to [31]. The double read-out heat and light allows for an efficient particle identification as already proved by many cryogenic scintillating bolometers [32,33,34] The detector response was studied using different types of calibration source: 228 Th as β/γ source, and AmBe for neutrons. The internal radiopurity of the crystal was also investigated performing background runs.…”

First search for Lorentz violation in double beta decay with scintillating calorimeters

“…Time, amplitude, pulse shape, light output and other pulse information were extracted from the collected events following the procedure described in [20]. Selection cuts were applied to the data to exclude nonparticle events, with a total efficiency of = (95.7±0.5)%, constant above 150 keV [17].…”