Abstract
Employing the improved scission-point model, the isotopic and excitation energy trends of the charge distribution of fission fragments are studied in fission of even-even Th isotopes at low and high excitation energies.
Highlights
With increasing neutron number of fissioning even-even Th isotopes the transition from one-peaked to two-peaked charge distribution of fission fragments occurs through transient threepeaked shape in which the symmetric and asymmetric components of the distribution have almost equal weights [1]
In the case of high-energy neutron-induced fission of 238U [2], the experimental data show that the mass distribution maintains two-peaked shape even at neutron energies of 50–60 MeV
The shell effects are expected to be washed out, and the nucleus is supposedly left with a dominant symmetric mode, that is contrary to the experiments
Summary
With increasing neutron number of fissioning even-even Th isotopes the transition from one-peaked to two-peaked charge distribution of fission fragments occurs through transient threepeaked shape in which the symmetric and asymmetric components of the distribution have almost equal weights [1]. The general opinion is that the competition between symmetric and asymmetric fission modes is related to the deformed shells. In the case of high-energy neutron-induced fission of 238U [2], the experimental data show that the mass distribution maintains two-peaked shape even at neutron energies of 50–60 MeV. At these excitation energies, the shell effects are expected to be washed out, and the nucleus is supposedly left with a dominant symmetric mode, that is contrary to the experiments. The most important ingredient of the model is the potential energy of system as a function of charge (mass) asymmetry, deformations of the fission fragments, and internuclear distance. The knowledge of the deformations of nascent fragments at scission point is crucial
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