arXiv:nucl-th/9804055·v1·Nuclear Theory
Widths of Isobaric Analog Resonances: a microscopic approach
G. Colo`(1) · H. Sagawa(2) · N. Van Giai(3) · P.F. Bortignon(1) · T. Suzuki(4) ((1) Dipartimento di Fisica, Universita` degli Studi, Milano, Italy; (2) The University of Aizu, Aizu-Wakamatsu, Japan; (3) Institut de Physique Nucleaire, Orsay, France; (4) Department of Physics, Nihon University, Tokyo, Japan)
Abstract
A self-consistent particle-phonon coupling model is used to investigate the properties of the isobaric analog resonance in 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.
Comments: 18 pages, 1 figure. To appear on Phys. Rev. C (tentatively scheduled for June 1998)