Phonon and light read out of a Li${}_2$MoO${}_4$ crystal with multiplexed kinetic inductance detectors

Abstract

Molybdenum based crystals such as Li${}_2$MoO${}_4$ and CaMoO${}_4$ are emerging as leading candidates for next generation experiments searching for neutrino-less double beta decay with cryogenic calorimeters (CUPID, AMoRE). The exquisite energy resolution and high radio-purity of these crystals come at the cost of a potentially detrimental background source: the two neutrinos double beta decay of ${}^{100}$Mo. Indeed, the fast half-life of this decay mode, combined with the slow response of cryogenic calorimeters, would result in pile-up events in the energy region of interest for neutrino-less double beta decay, reducing the experimental sensitivity. This background can be suppressed using fast and high sensitivity cryogenic light detectors, provided that the scintillation time constant itself does not limit the time resolution. We developed a new detection technique exploiting the high sensitivity, the fast time response and the multiplexing capability of Kinetic Inductance Detectors. We applied the proposed technique to a $2\times 2\times 2$ cm${}^3$ Li${}_2$MoO${}_4$ crystal, which was chosen as baseline option for CUPID. We measured simultaneously both the phonon and scintillation signals with KIDs. We derived the scintillation time constant of this compound at millikelvin temperatures obtaining ${\tau }_{scint}=84.5\pm 4.5(\mathrm{syst})\pm 1.0(\mathrm{stat})$ $\mu$s, constant between 10 and 190 mK.

7 pages, 9 figures

References in corpus (10)

• Precise half-life values for two neutrino double beta decay
• The projected background for the CUORE experiment
• Development of ${}^{100}$Mo-containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search
• CUPID-0: the first array of enriched scintillating bolometers for 0νββdecay investigations
• Position and energy-resolved particle detection using phonon-mediated microwave kinetic inductance detectors
• Al/Ti/Al phonon-mediated KIDs for UV-VIS light detection over large areas
• Analysis of cryogenic calorimeters with light and heat read-out for double beta decay searches
• Measurements and simulations of athermal phonon transmission from silicon absorbers to aluminium sensors
• Rejection of randomly coinciding events in ZnMoO${}_4$ scintillating bolometers
• Cryogenic light detectors with enhanced performance for rare events physics

Cited by in corpus (7)

• Applications for Microwave Kinetic Induction Detectors in Advanced Instrumentation
• Superconducting detectors for rare event searches in experimental astroparticle physics
• Performance of a Large Area Photon Detector For Rare Event Search Applications
• CUPID, the CUORE Upgrade with Particle IDentification
• Final results of CALDER: Kinetic inductance light detectors to search for rare events
• First demonstration of a TES based cryogenic Li${}_2$MoO${}_4$detector for neutrinoless double beta decay search
• Cryogenic light detectors with thermal signal amplification for $0\nu \beta \beta$ search experiments