Unrestricted symmetry-projected Hartree-Fock- Bogoliubov calculations for some PF-shell nuclei

Total binding energies and yrast energy spectra of three selected 1p0f-nucl ei have been calculated using an unrestricted Hartree-Fock-Bogoliubov appro ach with symmetry-projection before the variation. The full 1p0f-shell has been used as single-particle basis and the semi-empirical FPD6 interaction as effective Hamiltonian. The results are compared to those of truncated sh ell-model calculations performed with the OXBASH code. In the middle of the 1p0f-shell the variational method yields energy gains up to 4.5 MeV and th us proves to be far superior than the conventional truncation methods at le ast if in the latter only up to about 13000 configurations for each spin-is ospin combination are admitted.