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Enriched TeO 2 bolometers with active particle discrimination: Towards the CUPID experiment

  • Author(s): Artusa, DR
  • Avignone, FT
  • Beeman, JW
  • Dafinei, I
  • Dumoulin, L
  • Ge, Z
  • Giuliani, A
  • Gotti, C
  • de Marcillac, P
  • Marnieros, S
  • Nagorny, S
  • Nisi, S
  • Nones, C
  • Norman, EB
  • Novati, V
  • Olivieri, E
  • Orlandi, D
  • Pagnanini, L
  • Pattavina, L
  • Pessina, G
  • Pirro, S
  • Poda, DV
  • Rusconi, C
  • Schäffner, K
  • Scielzo, ND
  • Zhu, Y
  • et al.
Abstract

© 2017 The Authors 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.

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