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An innovative bolometric Cherenkov-light detector for a double beta decay search

  • Author(s): Novati, V
  • 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
  • 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 Elsevier B.V. We present here an innovative cryogenic light detector capable to measure a few tens of eV signal thanks to the amplification assisted by the Neganov-Luke effect. The thermal signal boost in the presence of an electric field allows us to improve the signal-to-noise ratio reaching a baseline noise of around 20 eV. This device - coupled to an enriched 130TeO2 bolometer (435 g) - registered 160 eV Cherenkov light signal induced by 2615 keV208Tl with a signal to noise ratio about 6:1. Since α particles emitted in decays of natural radionuclides do not produce the Cherenkov radiation, we were able to achieve an efficient α/γ separation in the region of interest for neutrinoless double beta decay of130Te (Q-value is 2527 keV). Specifically, a rejection factor of 99.9% for α particles was obtained with a 98.3% acceptance of β/γ events. The achieved α rejection efficiency is required to reduce the dominant α background in the follow-up of the CUORE experiment (CUPID), a ton-scale bolometric search with particle identification.

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