Semimicroscopical description of the simplest photonuclear reactions accompanied by excitation of the giant dipole resonance in medium-heavy mass nuclei
V. A. Rodin, M. H. Urin
Abstract
A semimicroscopical approach is applied to describe photoabsorption and partial photonucleon reactions accompanied by the excitation of the giant dipole resonance (GDR). The approach is based on the continuum-RPA (CRPA) with a phenomenological description for the spreading effect. The phenomenological isoscalar part of the nuclear mean field, momentum-independent Landau-Migdal particle-hole interaction, and separable momentum-dependent forces are used as input quantities for the CRPA calculations. The experimental photoabsorption and partial (n,γ)-reaction cross sections in the vicinity of the GDR are satisfactorily described for 89Y, 140Ce and 208Pb target nuclei. The total direct-neutron-decay branching ratio for the GDR in 48Ca and 208Pb is also evaluated.
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