Microscopic quasiparticle-phonon description of beta decays of 113Cd and 115In using proton-neutron phonons

The fourth-forbidden non-unique ground-state-to-ground-state beta decays of 113Cd and 115In are calculated using a realistic microscopic two-body interaction and a realistic single-particle model space. To describe the involved initial and final nuclear states we introduce a proton-neutron variant of the microscopic quasiparticle-phonon model (MQPM), the proton-neutron MQPM (pnMQPM). The states of the pnMQPM are created by coupling quasiparticles with phonons of the proton-neutron quasiparticle random-phase approximation (pnQRPA). The computed half-lives and logft values are found to be in excellent agreement with experimental data. Computed beta spectra of the decays are also given.