Author/Authors :
C. Arnaboldi، نويسنده , , C. Brofferio، نويسنده , , C. Bucci، نويسنده , , S. Capelli، نويسنده , , O. Cremonesi، نويسنده , , E. Fiorini، نويسنده , , A. Giuliani، نويسنده , , A. Nucciotti، نويسنده , , M. M. Pavan، نويسنده , , M. Pedretti، نويسنده , , G. Pessina، نويسنده , , S. Pirro ، نويسنده , , C. Pobes، نويسنده , , E. Previtali، نويسنده , , Helene M. Sisti، نويسنده , , M. Vanzini، نويسنده ,
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.
