Enriched TeO${}_2$ bolometers with active particle discrimination: towards the CUPID experiment

Abstract

We present the performances of two 92% enriched ${}^{130}$TeO${}_2$ crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of ${}^{130}$Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV $\gamma$-line of ${}^{208}$Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from ${}^{238}$U (15 and 8 $\mu$Bq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay, ${}^{226}$Ra and ${}^{228}$Th, are both evaluated as $<$3.1 $\mu$Bq/kg for one crystal and $<$2.3 $\mu$Bq/kg for the second. Thanks to the readout of the weak Cherenkov light emitted by $\beta /\gamma$ particles by means of Neganov-Luke bolometric light detectors we were able to perform an event-by-event identification of $\beta /\gamma$ events with a 95% acceptance level, while establishing a rejection factor of 98.21% and 99.99% for $\alpha$ particles.

References in corpus (7)

• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
• Measurement of the inclusive 3-jet production differential cross section in proton-proton collisions at 7 TeV and determination of the strong coupling constant in the TeV range
• Validation of techniques to mitigate copper surface contamination in CUORE
• TeO${}_2$ bolometers with Cherenkov signal tagging: towards next-generation neutrinoless double beta decay experiments
• Particle Discrimination in TeO${}_2$ Bolometers using Light Detectors read out by Transition Edge Sensors
• Neganov-Luke amplified cryogenic light detectors for the background discrimination in neutrinoless double beta decay search with TeO${}_2$ bolometers
• R&D towards CUPID (CUORE Upgrade with Particle IDentification)

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