We report on the final results of a series of experiments on double beta decay of 130Te carried out with an array of twenty cryogenic detectors. The set-up is made with crystals of TeO2 with a total mass of 6.8 kg, the largest operating one for a cryogenic experiment. Four crystals are made with isotopically enriched materials: two in 128Te and two others in 130Te. The remaining ones are made with natural tellurium, which contains 31.7% and 33.8% 128Te and 130Te, respectively. The array was run under a heavy shield in the Gran Sasso Underground Laboratory at a depth of about 3500 m.w.e. By recording the pulses of each detector in anticoincidence with the others a lower limit of 2.1 × 1023 years has been obtained at the 90% C.L. on the lifetime for neutrinoless double beta decay of 130Te. In terms of effective neutrino mass this leads to the most restrictive limit in direct experiments, after those obtained with Ge diodes. Limits on other lepton violating decays of 130Te and on the neutrinoless double beta decay of 128Te to the ground state of 128Xe are also reported and discussed. An indication is presented for the two neutrino double beta decay of 130Te. Some consequences of the present results in the interpretation of geochemical experiments are discussed. (c)2003 Elsevier Science B.V. All rights reserved.

Arnaboldi, C., Brofferio, C., Bucci, C., Capelli, S., Cremonesi, O., Fiorini, E., et al. (2003). A calorimetric search on double beta decay of 130Te. PHYSICS LETTERS. SECTION B, 557(3-4), 167-175 [10.1016/S0370-2693(03)00212-0].

A calorimetric search on double beta decay of 130Te

BROFFERIO, CHIARA;CAPELLI, SILVIA;Cremonesi, O;FIORINI, ETTORE;NUCCIOTTI, ANGELO ENRICO LODOVICO;PAVAN, MAURA;Previtali, E;SISTI, MONICA;
2003

Abstract

We report on the final results of a series of experiments on double beta decay of 130Te carried out with an array of twenty cryogenic detectors. The set-up is made with crystals of TeO2 with a total mass of 6.8 kg, the largest operating one for a cryogenic experiment. Four crystals are made with isotopically enriched materials: two in 128Te and two others in 130Te. The remaining ones are made with natural tellurium, which contains 31.7% and 33.8% 128Te and 130Te, respectively. The array was run under a heavy shield in the Gran Sasso Underground Laboratory at a depth of about 3500 m.w.e. By recording the pulses of each detector in anticoincidence with the others a lower limit of 2.1 × 1023 years has been obtained at the 90% C.L. on the lifetime for neutrinoless double beta decay of 130Te. In terms of effective neutrino mass this leads to the most restrictive limit in direct experiments, after those obtained with Ge diodes. Limits on other lepton violating decays of 130Te and on the neutrinoless double beta decay of 128Te to the ground state of 128Xe are also reported and discussed. An indication is presented for the two neutrino double beta decay of 130Te. Some consequences of the present results in the interpretation of geochemical experiments are discussed. (c)2003 Elsevier Science B.V. All rights reserved.
No
Articolo in rivista - Articolo scientifico
Scientifica
Double beta decay; Neutrino mass
English
167
175
9
Arnaboldi, C., Brofferio, C., Bucci, C., Capelli, S., Cremonesi, O., Fiorini, E., et al. (2003). A calorimetric search on double beta decay of 130Te. PHYSICS LETTERS. SECTION B, 557(3-4), 167-175 [10.1016/S0370-2693(03)00212-0].
Arnaboldi, C; Brofferio, C; Bucci, C; Capelli, S; Cremonesi, O; Fiorini, E; Giuliani, A; Nucciotti, A; Pavan, M; Pedretti, M; Pessina, G; Pirro, S; Pobes, C; Previtali, E; Sisti, M; Vanzini, M
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/35932
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