科研之友
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摘要
We describe the fusion-fission processes within the two-stage reaction model. On the first stage (the entrance channel) the time evolution of the system up to the touching point is calculated. All possible orientations of the colliding nuclei are taken into account. The distributions at the touching point obtained on the first step are used for the transition from separated ions to the compact system and as the initial conditions for the description of evolution of compact system (second stage). Both the approach of ions and the evolution of the compact system are described with the help of Langevin equations for the collective coordinates (deformation parameters) which specify the configuration of the system. In both stages the shell structures of the colliding ions and the compound nucleus are taken into account. Within this model we obtain the information on the touching probability and the observable measured in the fusion-fission reactions (mass and energy distributions of the fission fragments, the compound nucleus, and the evaporation residue formation cross sections). In the present work we have carried out the calculations for the reactions Ni-64 + U-238 -> (302-x)120 + xn, Fe-58 + Pu-244 -> (302-x)120 + xn, Cr-54 + Cm-248 -> (302-x)120 + xn, leading to the synthesis of an element with Z = 120. The calculated results are compared with the available experimental data and other theoretical predictions.
- 出版日期2014-3-28
