The Beliaev-Zelivinsky boson expansion and particle-vibration coupling methods in an exactly soluble model
Daniel R. Bes, Jared A. Evans, N C Kraus
The Beliaev-Zelivinsky boson expansion and particle-vibration coupling methods are studied in comparison with an exact treatment of the monopole model. Two of the three boson expansions considered were valid for all interaction strengths. A third expansion and the particle-vibration coupling method were found to be equivalent to perturbation theory. The difficulty associated with the overcompleteness of the basis in the particle-vibration coupling method was resolved both in the computation of the energies and the matrix element of the monopole specific operator.
Journal of Physics A Mathematical Nuclear and General•Jan 1, 1973•1 citation