2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204046A new theoretical approach is presented that combines the Hartree-Fock variational scheme with the exact solution of the pairing problem in the finite orbital space. Using this formulation in the sd-space as an example, we show that the exact pairing significantly improves the results for the ground state energy5 pages, 5 figuresNuclear Theorytext