Abstract
Abstract The two-neutrino double-beta (2νβ⨿) decay to excited final states is discussed in the framework of the quasiparticle random-phase approximation (QRPA). The excited states are assumed to have the structure of one or two QRPA phonons. The 2νββ decay of 76 Se and 136 Ba, as well as some electromagnetic observables, are discussed as an application of the present formalism. The calculations have been performed using realistic nucleon-nucleon interaction and explicit summation over the virtual states of the intermediate nucleus. It is found that contrary to the decay to the ground state, the decay rate to the excited states is only very weakly dependent upon the strength of the particle-particle channel of the two-body interaction. This makes these decays more independent of the parametrization of the residual interaction and thus attractive in view of comparison with experimental data.
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