E. Hammaren et al., UNRESTRICTED SYMMETRY-PROJECTED HARTREE-FOCK-BOGOLIUBOV CALCULATIONS FOR SD-SHELL NUCLEI, EUROPEAN PHYSICAL JOURNAL A-HADRONS AND NUCLEI, 2(4), 1998, pp. 371-377
The solution of the Hartree-Fock-Bogoliubov problem with restoration o
f the broken symmetries before the variation has been generalized for
the use of totally unrestricted quasi-particle determinants. With this
method doubly-even, doubly-odd and odd nuclei can be treated on the s
ame footing. Comparison with the results of complete shell-model diago
nalizations shows that already one-determinant representations yield a
very good approximation to the exact solutions even in the middle of
the 1s0d shell. The problem is especially suited for numerical impleme
ntation on parallel computers. First tests show a linear dependence of
the inverse CPU time with the number of processors used.