The CUORICINO ßß-decay detector is an array of 62 TeO2 bolometers; 44 are 5 × 5 × 5-cm crystals made with natural tellurium (33.8% 130Te). There are 18, 3 × 3 × 6-cm crystals, 14 of which are made of natural tellurium, 2 are isotopically enriched to 75% in 130Te, and 2 are enriched to 82.3% in 128Te. The total mass of 130Te is ~ 11 kg. The background rate is 0.23 ± 0.04 counts/keV/kg/yr in the energy interval 2480 to 2600 keV. During the cooling process, some of the wires became disconnected and only 32 of the large and 16 of the smaller crystals could be read out. The data presented here come from 29 of the 5×5×5-cm crystals containing 6.2 kg of 130Te. The new limit on the half-life is T0v >= 5×1023 yr, corresponding to an effective Majorana mass of the electron neutrino <mv> between 0.42 and 2.05 eV, depending on the nuclear model used to analyze the data.
Arnaboldi, C., Artusa, D., Avignone, F., Balata, M., Bandac, I., Barucci, M., et al. (2004). The CUORICINO Te-130 ββ-decay experiment and a new limit on T_1/2(0ν)(ββ). PHYSICS OF ATOMIC NUCLEI, 67(6), 1220-1226 [10.1134/1.1772464].
The CUORICINO Te-130 ββ-decay experiment and a new limit on T_1/2(0ν)(ββ)
ARNABOLDI, CLAUDIO;BROFFERIO, CHIARA;CAPELLI, SILVIA;Cremonesi, O;FIORINI, ETTORE;GORLA, PAOLO;NUCCIOTTI, ANGELO ENRICO LODOVICO;PAVAN, MAURA;Pessina, G;Previtali, E;SISTI, MONICA;
2004
Abstract
The CUORICINO ßß-decay detector is an array of 62 TeO2 bolometers; 44 are 5 × 5 × 5-cm crystals made with natural tellurium (33.8% 130Te). There are 18, 3 × 3 × 6-cm crystals, 14 of which are made of natural tellurium, 2 are isotopically enriched to 75% in 130Te, and 2 are enriched to 82.3% in 128Te. The total mass of 130Te is ~ 11 kg. The background rate is 0.23 ± 0.04 counts/keV/kg/yr in the energy interval 2480 to 2600 keV. During the cooling process, some of the wires became disconnected and only 32 of the large and 16 of the smaller crystals could be read out. The data presented here come from 29 of the 5×5×5-cm crystals containing 6.2 kg of 130Te. The new limit on the half-life is T0v >= 5×1023 yr, corresponding to an effective Majorana mass of the electron neutrino
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