2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202909A self-consistent particle-phonon coupling model is used to investigate the properties of the isobaric analog resonance in $^{208}$Bi. It is shown that quantitative agreement with experimental data for the energy and the width can be obtained if the effects of isospin-breaking nuclear forces are included, in addition to the Coulomb force effects. A connection between microscopic model predictions and doorway state approaches which make use of the isovector monopole resonance, is established via a phenomenological ansatz for the optical potential.18 pages, 1 figure. To appear on Phys. Rev. C (tentatively scheduled for June 1998)Nuclear Theorytext