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 description of doorway-state coupling to many-quasiparticle configurations. Apart from the phenomenological mean field, the separable isovector momentum-dependent forces are taken into consideration together with the momentum-independent Landau–Migdal interaction. It allows us to describe satisfactorily the experimental values of the GDR energy and the photoabsorption cross section integrated over the GDR in 208Pb along with some partial 208Pb(n,γ)-reaction 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.