2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190566A dynamical valence and sea quark mixing model is shown to fit the baryon ground state properties as well as the spin content of the nucleon. The relativistic correction and the $q^3{\leftrightarrow} q^3q\bar{q}$ transition terms induced by the quark axial vector current $\barψ\vecγγ^5ψ$ in this model space is responsible for the quark spin reduction.11 pages, Latex, one figure, to be published in Phys. Rev. C57High Energy Physics - Phenomenologytext