Preequilibrium model of photonucleon reactions that is based on Fermi gas densities
- Moscow State University, Institute of Nuclear Physics (Russian Federation)
A combination of the exciton and evaporation models is used to describe photonucleon reactions induced in heavy and medium-mass nuclei by photons of energy in the range 7 {<=} E{sub {gamma}} {<=} 140 MeV. The formation of a giant dipole resonance and quasideuteron absorption are considered as two mechanisms that are responsible for the photoexcitation of a nucleus in the energy regions E{sub {gamma}} Less-Than-Or-Equivalent-To 20 MeV and E{sub {gamma}} Greater-Than-Or-Equivalent-To 40 MeV, respectively. As is well known, the densities of particle-hole states are employed in the exciton model, and these quantities are calculated on the basis of the Fermi gas model. This makes it possible to take into account the effect of the energy dependence of single-particle and single-hole densities of states on the rate of emission and intranuclear processes. The model in question is applied to describing partial photonucleon cross sections for {sup 119}Sn, {sup 140}Ce, {sup 181}Ta, and {sup 208}Pb nuclei.
- OSTI ID:
- 22028132
- Journal Information:
- Physics of Atomic Nuclei, Vol. 71, Issue 3; Other Information: Copyright (c) 2008 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7788
- Country of Publication:
- United States
- Language:
- English
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