The Perusal of Photofission Fragments Mass Yields for Actinide Isotopes by Systematics Neutron Models

Resumo

Three neutron-induced models have been investigated for photofission phenomena. The fission fragment mass yields were calculated for actinide isotopes by three neutron induced models on a logarithm scale and compared with photofission experimental data. The peak-to-valley ratios for photofission of ²³²Th, ²⁴⁰Pu and ²³⁸U were calculated and compared with the photofission experimental works. There are considerable differences between the calculated results and experimental works for photofission of ²³²Th. Then, the yields of symmetric and asymmetric fission products for photofission of ²³²Th were calculated. Comparison of the calculation and experimental results showed that this nucleus should be separated from others in formalism. The average light mass (〈A_L〉) and heavy mass (〈A_H〉) were calculated for photofission of other Actinide isotopes at different excitation energies. At last, the fission fragment mass yields were studied with changing the number of emitted neutrons for those models with comparing to photofission experimental data. From the carried out calculations, it is to see that all models cannot describe the total set of the experimental data on the photofission of Actinide nuclei. This means that it is necessary to revise the basic theoretical representation about the nature of photofission processes in the dependence on the energy, at least.