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Double-beta decay investigation with highly pure enriched [Formula: see text]Se for the LUCIFER experiment.

  • Author(s): Beeman, JW;
  • Bellini, F;
  • Benetti, P;
  • Cardani, L;
  • Casali, N;
  • Chiesa, D;
  • Clemenza, M;
  • Dafinei, I;
  • Domizio, S Di;
  • Ferroni, F;
  • Gironi, L;
  • Giuliani, A;
  • Gotti, C;
  • Laubenstein, M;
  • Maino, M;
  • Nagorny, S;
  • Nisi, S;
  • Nones, C;
  • Orio, F;
  • Pagnanini, L;
  • Pattavina, L;
  • Pessina, G;
  • Piperno, G;
  • Pirro, S;
  • Previtali, E;
  • Rusconi, C;
  • Schäffner, K;
  • Tomei, C;
  • Vignati, M
  • et al.
Abstract

The LUCIFER project aims at deploying the first array of enriched scintillating bolometers for the investigation of neutrinoless double-beta decay of [Formula: see text]Se. The matrix which embeds the source is an array of ZnSe crystals, where enriched [Formula: see text]Se is used as decay isotope. The radiopurity of the initial components employed for manufacturing crystals, that can be operated as bolometers, is crucial for achieving a null background level in the region of interest for double-beta decay investigations. In this work, we evaluated the radioactive content in 2.5 kg of 96.3 % enriched [Formula: see text]Se metal, measured with a high-purity germanium detector at the Gran Sasso deep underground laboratory. The limits on internal contaminations of primordial decay chain elements of [Formula: see text]Th, [Formula: see text]U and [Formula: see text]U are respectively: [Formula: see text]61, [Formula: see text]110 and [Formula: see text]74 [Formula: see text]Bq/kg at 90 % C.L. The extremely low-background conditions in which the measurement was carried out and the high radiopurity of the [Formula: see text]Se allowed us to establish the most stringent lower limits on the half-lives of the double-beta decay of [Formula: see text]Se to 0[Formula: see text], 2[Formula: see text] and 2[Formula: see text] excited states of [Formula: see text]Kr of 3.4[Formula: see text]10[Formula: see text], 1.3[Formula: see text]10[Formula: see text] and 1.0[Formula: see text]10[Formula: see text] y, respectively, with a 90 % C.L.

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