The Role of Ground State Correlations in the Single-Particle Strength of   Odd Nuclei with Pairing
  A method based on the consistent use of the Green function formalism has been developed to calculate the distribution of the single-particle strength in odd nuclei with pairing. The method takes into account the quasiparticle-phonon interaction, ground state correlations and a "refinement" of phenomenological single-particle energies and pairing gap values from the quasiparticle-phonon interaction under consideration. The calculations for 121Sn and 119Sn that were performed in the quasiparticle$\otimes$phonon approximation, have shown a reasonable agreement with experiment. The ground state correlations play a noticeable role and mostly improve the agreement with experiment or shift the results to the right direction. 
A.V. Avdeenkov, S.P. Kamerdzhiev (Institute of Physics and Power   Engineering, Obninsk, Russia)