Effects of the ground state correlations on the structure of vibrational   states
  A method to treat the ground state correlations beyond the RPA is presented. A set of nonlinear equations taking into account effects of the ground state correlations on the pairing and phonon-phonon coupling is derived. The influence of such correlations on properties of the vibrational states in spherical nuclei is studied. 
D. Karadjov (1), V.V. Voronov (2), F. Catara (3), M. Grinberg (1) and   A.P. Severyukhin (2) ((1) Institute for Nuclear Rese...