Abstract
The photofission fragment mass yields of actinides are evaluated using a systematic statistical scission point model. In this model, all energies at the scission point are presented as a linear function of the mass numbers of fission fragments. The mass yields are calculated with a new approximated relative probability for each complementary fragment. The agreement with the experimental data is quite good, especially with a collective temperature Tcol of 2 MeV at intermediate excitation energy and Tcol = 1 MeV for spontaneous fission. This indicates that the collective temperature is greater than the value obtained by the initial excitation energy. The generalized superfluid model is applied for calculating the fragment temperature. The deformation parameters of fission fragments have been obtained by fitting the calculated results with the experimental values. This indicates that the deformation parameters decrease with increasing excitation energy. Also, these parameters decrease for fissioning systems with odd mass numbers.
Highlights
Since the fission discovery, the experimental and theoretical fission mass yields have been continuously developed
For photofission, the height of the fission barrier is added to the initial excitation energy (i.e., 6+E MeV for 238U)
By increasing the excitation energy by 20 MeV, the mass distribution changes by less than 1 percent. This small effect indicates that the major effect of the excitation energy in mass yield values is due to the change in collective temperature
Summary
The experimental and theoretical fission mass yields have been continuously developed. The statistical model can predict transitions between symmetric and asymmetric modes in the region of heavy actinides, the calculated results are inaccurate compared to the experimental data This problem is found where the calculated results were smeared (refined) by the Gaussian model with the width 1.5 amu to obtain a smoother curve [8]. Photofission Mass Yields of Actinides between the potential energy of the fissioning nucleus and the potential energy of one of the fragments at the scission point to the initial excitation energy to obtain excitation energy (i.e., E* Q+E+Ucn−Ui). A systematic method is presented to calculate mass yields for actinides; the fewer parameters and refinements are included in this framework For this reason, all energies at the scission point are formulated as a function of the mass number of fission fragments. All mass yields for photofission of actinides are calculated and compared with the experimental data (Section 3)
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