Abstract
The dynamical properties of the new ternary fission in heavy 197Au+197Au at 15 MeV/nucleon have been investigated by using the improved quantum molecular dynamics model. The dependencies of the production probability, lifetime, the time interval, and angular distribution on the impact parameter are carefully studied. The calculation results show that the characteristics of these are very different between the small and the large impact parameter. Comparing the theoretical results with the experimental data, one can obtain that the fast ternary breakup likely occurs at the impact parameter region b = 7 ‐ 9 fm. The nonisotropic of angular distribution and the short time interval among two fissions indicates that the fast ternary fission is a nonequilibrium and violent process.
Highlights
Heavy-ion collisions have been paid much attention for several decades, and multifragmentation is a common phenomenon in the intermediate-energy heavy-ion collisions
The results show that the improved quantum molecular dynamics (ImQMD) is suitable to study the heavy nuclear reaction of 197Au+197Au system at an energy of 15 MeV/nucleon
We have found the production probability of the new ternary fission is different at each impact parameter, and it is worthwhile to clarify this question
Summary
Heavy-ion collisions have been paid much attention for several decades, and multifragmentation is a common phenomenon in the intermediate-energy heavy-ion collisions. The experimental researches on collisions of a very heavy system 197Au+197Au have been carried out at energy of 15 MeV/nucleon, by using the CHIMERA multidetector array arranged in 4π geometry at the Laboratori Nazionali del Sud (LNS) in Catania Their preliminary result showed that a violent process of reseparation into three fragments with comparable size was founded in this heavy system. The improved quantum molecular dynamics (ImQMD) model, which both the mean-field and the nucleon-nucleon collisions as well as the Pauli principle are treated properly and may be a suit way to simulate the nuclear action in low energy Both the experimental and the theoretical studies on the new ternary fission indicate that it is worthwhile and meaningful to research the dynamical mechanism of the new ternary fission. The dynamical properties of them are comprehensive studied, such as the fission modes and their probabilities, the angular distributions of fragments, and the time scale of the secondary fission
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