Speaker
Description
We use the available experimental Gamow-Teller beta and electron-capture decay rates between 0 and 1+ ground states in neighboring even-even and odd-odd nuclei, combined with two-neutrions double beta half-lives, to analyze the influence of the nuclear environment on the weak axial-vector strength. For this purpose, the proton-neutron deformed quasiparticle random-phase approximation with a schematic dipole residual interaction is employed. The Hamiltonian contains particle-hole and particle-particle channels with mass-dependent strengths. In deriving the equations of motion we use a self-consistent procedure in terms of a single-particle basis with projected angular momentum provided by the diagonalization of a spherical mean field plus the quadrupole-quadrupole interaction.