2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81565The odd-even mass staggering (OES) of nuclei is analyzed in the context of self-consistent mean-field calculations. The procedure developed allows to understand the OES for spherical as well as for deformed nuclei. Comparison with results at the Hartree-Fock level shows the non-perturbative effect on this observable of the inclusion of pairing correlations.4 pages, submitted to Phys. Rev. LettNuclear Theorytext