We present the performances of two 92% enriched 130TeO2 crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of 130Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV γ-line of 208Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from 238U (15 and 8 μBq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay, 226Ra and 228Th, are both evaluated as <3.1 μBq/kg for one crystal and <2.3 μBq/kg for the second. Thanks to the readout of the weak Cherenkov light emitted by β/γ particles by means of Neganov–Luke bolometric light detectors we were able to perform an event-by-event identification of β/γ events with a 95% acceptance level, while establishing a rejection factor of 98.21% and 99.99% for α particles.

Enriched TeO2 bolometers with active particle discrimination: Towards the CUPID experiment

GIULIANI, ANDREA ERNESTO GUIDO;
2017-01-01

Abstract

We present the performances of two 92% enriched 130TeO2 crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of 130Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV γ-line of 208Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from 238U (15 and 8 μBq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay, 226Ra and 228Th, are both evaluated as <3.1 μBq/kg for one crystal and <2.3 μBq/kg for the second. Thanks to the readout of the weak Cherenkov light emitted by β/γ particles by means of Neganov–Luke bolometric light detectors we were able to perform an event-by-event identification of β/γ events with a 95% acceptance level, while establishing a rejection factor of 98.21% and 99.99% for α particles.
2017
http://www.sciencedirect.com/science/journal/03702693
Bolometers; Cherenkov emission; Double beta decay; Isotope enrichment; Neganov–Luke effect; Nuclear and High Energy Physics
Artusa, D. R.; Avignone, F. T.; Beeman, J. W.; Dafinei, I.; Dumoulin, L.; Ge, Z.; Giuliani, ANDREA ERNESTO GUIDO; Gotti, C.; de Marcillac, P.; Marnieros, S.; Nagorny, S.; Nisi, S.; Nones, C.; Norman, E. B.; Novati, V.; Olivieri, E.; Orlandi, D.; Pagnanini, L.; Pattavina, L.; Pessina, G.; Pirro, S; Poda, D. V.; Rusconi, C.; Schã¤ffner, K.; Scielzo, N. D.; Zhu, Y.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2064436
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