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

A semimicroscopical approach is applied for describing partial photonucleon reactions accompanied by excitation of the giant dipole resonance (GDR). The approach is based on the continuum-RPA and phenomenological description of the 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 particle-hole interaction. It allows us to describe satisfactorily the experimental values of the GDR energy and the photoabsorption cross section integrated over GDR in (208)pb along with some partial Pb-208(n gamma)- 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.