The renormalized proton-neutron quasiparticle random-phase approximation model (RQRPA) has been used to calculate double-{β}-decay matrix elements and associated transition half-lives for two-neutrino double {β} decay of parent nuclei ⁷⁶Ge, ⁷⁸Kr, ⁸²Se, ⁹⁶Zr, ¹⁰⁶Cd, and ¹³⁰Te to the ground state and excited one- and two-phonon states of their daughter nuclei. The results are compared to ordinary proton-neutron QRPA and experiments. In addition, the violation of the Ikeda sum rule in the RQRPA is examined and discussed.
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Toivanen et al. (1997) studied this question.
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