Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-10-16
Phys.Rev. C67 (2003) 044311
Physics
Nuclear Physics
Nuclear Theory
26 pages, 6 figures. Revised version, accepted for publication in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.67.044311
The Goldstone-Brueckner perturbation theory is extended to incorporate in a simple way correlations associated with large amplitude collective motions in nuclei. The new energy expansion making use of non-orthogonal vacua still allows to remove the divergences originating from the hard-core of the bare interaction. This is done through the definition of a new Brueckner matrix summing generalized Brueckner ladders. At the lowest-order, this formalism motivates variational calculations beyond the mean-field such as the Generator Coordinate Method (GCM) and the Projected Mean-Field Method from a perturbative point of view for the first time. Going to higher orders amounts to incorporate diabatic effects in the GCM and to extend the projection technique from product states to well-defined correlated states.
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