Medium polarization isotopic effects on nuclear binding energies
  There exist several effective interactions whose parameters are fitted to force mean field predictions to reproduce experimental findings of finite nuclei and calculated properties of infinite nuclear matter. Exploiting this tecnique one can give a good description of nuclear binding energies. We present evidence that further progress can be made by taking into account medium polarization effects associated with surface and pairing vibrations. 
S.Baroni, F.Barranco, P.F.Bortignon, R.A.Broglia, G.Colo', E.Vigezzi