The structure of mixed symmetry states within microscopic multiphonon approach

The complex structure of low-lying states in near spherical nuclei is discussed within multiphonon approach. The approach is based on Quasiparticle-Phonon Model. This microscopic model goes beyond the quasiparticle random-phase approximation by treating a Hamiltonian of separable form in a microscopic multiphonon basis. It is therefore able to describe the anharmonic features of collective modes. A detailed explanation of the structure of mixed-symmetry states was given for many nuclei.