Spherical Hartree-Fock calculations with linear-momentum projection before the variation - Part II: Spectral functions and spectroscopic factors

The hole spectral functions and from these the spectroscopic factors have been calculated in a Galilei-invariant way for the ground-state wave functions resulting from spherical Hartree-Fock calculations with projection onto zero total linear momentum before the variation for the nuclei He-4, C-12, O-16, Si-28, S-32 and Ca-40. The results are compared to those of the conventional approach which uses the ground states resulting from usual spherical Hartree-Fock calculations subtracting the kinetic energy of the center-of-mass motion before the variation and to the results obtained analytically with oscillator occupations.