2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96228A mean field theory of expanding hybrid atom-molecule Bose-Einstein condensates is applied to the recent MPI experiments on ${}^{87}$Rb that demonstrated the formation of ultracold molecules due to Feshbach resonance. The subsequent dissociation of the molecules is treated using a non-mean-field parametric approximation. The latter method is also used in determining optimal conditions for the formation of molecular BEC5 pages with 5 figuresSoft Condensed Mattertext