New experimental results on double beta decay of 130Te
摘要
New results are presented of a search for double beta decay of Te isotopes carried out, using the bolometric technique, with an array of 20 natural tellurite crystals with a total cryogenic mass of 
6.8 kilograms. The array has been run at a temperature around 10 mK in the Gran Sasso Underground Laboratory. No evidence has been found for neutrinoless double beta decay of 128Te and 130Te and upper limits of 8.6 × 1022 and 1.44 × 1023 years, respectively, have been achieved at the 90%confidence level. From the latter we obtain limits on the lepton non-conserving parameters which are the most restrictive ones in direct experiments after those on 76Ge according to theoretical calculations. Results on two neutrino and majoron mediated decays are also presented and discussed with respect to those obtained for the same nuclei in geochemical experiments.
6.8 kilograms. The array has been run at a temperature around 10 mK in the Gran Sasso Underground Laboratory. No evidence has been found for neutrinoless double beta decay of 128Te and 130Te and upper limits of 8.6 × 1022 and 1.44 × 1023 years, respectively, have been achieved at the 90%confidence level. From the latter we obtain limits on the lepton non-conserving parameters which are the most restrictive ones in direct experiments after those on 76Ge according to theoretical calculations. Results on two neutrino and majoron mediated decays are also presented and discussed with respect to those obtained for the same nuclei in geochemical experiments.