Rejection of randomly coinciding events in Li${}_2$${}^{100}$MoO${}_4$ scintillating bolometers using light detectors based on the Neganov-Luke effect

Abstract

Random coincidences of nuclear events can be one of the main background sources in low-temperature calorimetric experiments looking for neutrinoless double-beta decay, especially in those searches based on scintillating bolometers embedding the promising double-beta candidate ${}^{100}$Mo, because of the relatively short half-life of the two-neutrino double-beta decay of this nucleus. We show in this work that randomly coinciding events of the two-neutrino double decay of ${}^{100}$Mo in enriched Li${}_2$${}^{100}$MoO${}_4$ detectors can be effectively discriminated by pulse-shape analysis in the light channel if the scintillating bolometer is provided with a Neganov-Luke light detector, which can improve the signal-to-noise ratio by a large factor, assumed here at the level of $\sim 750$ on the basis of preliminary experimental results obtained with these devices. The achieved pile-up rejection efficiency results in a very low contribution, of the order of $\sim 6\times 10^{-5}$ counts/(keV$\cdot$kg$\cdot$y), to the background counting rate in the region of interest for a large volume ($\sim 90$ cm${}^3$) Li${}_2$${}^{100}$MoO${}_4$ detector. This background level is very encouraging in view of a possible use of the Li${}_2$${}^{100}$MoO${}_4$ solution for a bolometric tonne-scale next-generation experiment as that proposed in the CUPID project.

References in corpus (12)

• Search for Majorana Neutrinos near the Inverted Mass Hierarchy Region with KamLAND-Zen
• Phase space factors for double-$\beta$ decay
• Energy density functional study of nuclear matrix elements for neutrinoless $\beta \beta$ decay
• $0\nu \beta \beta$ and $2\nu \beta \beta$ nuclear matrix elements in the interacting boson model with isospin restoration
• $0\nu \beta \beta$ and $2\nu \beta \beta$ nuclear matrix elements, QRPA, and isospin symmetry restoration
• Limits on the neutrino mass from neutrinoless double-$\beta$ decay
• Neutrinoless Double-Beta Decay: a Probe of Physics Beyond the Standard Model
• Q value of the 100Mo Double-Beta Decay
• Average and recommended half-life values for two neutrino double beta decay
• Recent Progress in Double Beta Decay
• Random coincidence of $2\nu 2\beta$ decay events as a background source in bolometric $0\nu 2\beta$ decay experiments
• Rejection of randomly coinciding events in ZnMoO${}_4$ scintillating bolometers

Cited by in corpus (19)

• Development of ${}^{100}$Mo-containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search
• Low background techniques in bolometers for double-beta decay search
• Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches
• Cryogenic light detectors with enhanced performance for rare events physics
• A multi-isotope $0\nu 2\beta$ bolometric experiment
• CUPID, the CUORE Upgrade with Particle IDentification
• Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers
• Final results of CALDER: Kinetic inductance light detectors to search for rare events
• Phonon and light read out of a Li${}_2$MoO${}_4$ crystal with multiplexed kinetic inductance detectors
• A first test of CUPID prototypal light detectors with NTD-Ge sensors in a pulse-tube cryostat
• 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
• A novel mechanical design of a bolometric array for the CROSS double-beta decay experiment
• 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
• Production cross sections of tetraquark states in elementary hadronic collisions
• $D$-wave excited $cs\bar{c}\bar{s}$ tetraquark states with $J^{PC}=1^{++}$ and $1^{+-}$
• High-bandwidth frequency domain multiplexed readout of transition-edge sensors for neutrinoless double beta decay searches
• Cryogenic light detectors with thermal signal amplification for $0\nu \beta \beta$ search experiments