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We report on the calculation of Gamow-Teller and double-beta decay propertiesfor nuclei around 132Sn within the framework of the realistic shell model. Theeffective shell-model Hamiltonian and Gamow-Teller transition operator arederived by way of many-body perturbation theory, without resorting to empiricaleffective quenching factor for the Gamow-Teller operator. The results are thencompared with the available experimental data, in order to establish thereliability of our approach. This is a mandatory step, before we apply the samemethodology, in forthcoming studies, to the calculation of the neutrinolessdouble-beta decay nuclear matrix element for nuclei that are currentlyconsidered among the best candidates for the detection of this process.

Calculation of Gamow-Teller and Two-Neutrino Double-Beta Decay Properties for 130Te and 136Xe with a realistic nucleon-nucleon potential