On the neutron radiative capture in the vicinity of the giant dipole resonance

A semimicroscopical approach is applied for describing partial photonucleon reactions accompanying the excitation of the giant dipole resonance (GDR). The approach is based on continuum-RPA and the phenomenological descriptio n of doorway-state coupling to many-quasiparticle configurations. Apart fro m the phenomenological mean field, the separable isovector momentum-depende nt forces are taken into consideration together with the momentum-independe nt Landau-Migdal interaction. It allows us to describe satisfactorily the e xperimental values of the GDR energy and the photoabsorption cross section integrated over the GDR in Pb-208 along with some partial Pb-208(n,gamma)-r eaction cross sections in the vicinity of the GDR. An attempt to establish a correspondence between the approach and the well-known DSD-model was also undertaken. (C) 2000 Elsevier Science B.V. All rights reserved.