 Main
Doublebeta decay investigation with highly pure enriched [Formula: see text]Se for the LUCIFER experiment.
 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.
Published Web Location
https://doi.org/10.1140/epjc/s100520153822xAbstract
The LUCIFER project aims at deploying the first array of enriched scintillating bolometers for the investigation of neutrinoless doublebeta 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 doublebeta 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 highpurity 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 lowbackground 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 halflives of the doublebeta 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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