Two-phonon structure of low-energy 1+ excitations of In130

Abstract

The 1 + spectrum of 130 In populated in the β-decay of 130 Cd is studied. The coupling between oneand two-phonon terms in the wave functions of 1 + states is taken into account within the microscopic model based on the Skyrme interaction. The approach enables one to perform the calculations in very large configurational spaces. The new calculation is extended by enlarging the variational space for the 1 + states with the inclusion of the two-phonon configurations. The dominant contribution to the additional 1 + states comes from the [3 + ⊗ 2 + ]QRP A two-phonon configurations constructed from the charge-exchange 3 + phonons. A correlation is found between the low-lying E2 transition strengths of the parent and daughter isobaric companions. Using the same set of parameters this correlation is studied also for 126,128 In and 126,128 Cd.