Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 45, Issue 1, Pages 121-124Publisher
SPRINGER
DOI: 10.1140/epja/i2010-10993-y
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Photonuclear reactions at energies covering the giant dipole resonance (GDR) region are analyzed with an approach based on nuclear photoabsorption followed by the process of competition between light-particle evaporation and fission for the excited nucleus. The photoabsorption cross-section at energies covering the GDR region is contributed by both the Lorentz-type GDR cross-section and the quasi-deuteron cross-section. The evaporation-fission process of the compound nucleus is simulated in a Monte Carlo framework. Photofission reaction cross-sections are analyzed in a systematic manner in the energy range of similar to 10-20MeV for the actinides Th-232, U-238 and Np-237. Photonuclear cross-sections for the medium-mass nuclei Cu-63 and Zn-64, for which there are no fission events, are also presented. The study reproduces satisfactorily the available experimental data of photofission cross-sections at GDR energy region and the increasing trend of nuclear fissility with the fissility parameter Z(2)/A for the actinides.
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