Speakers
Description
We present our first results for a microscopic simulation of symmetric boost fission in terms of the antisymmetrized molecular dynamics (AMD), which incorporates the mean-field effects (as the TDDFT) via SLy4 effective interaction as well as stochastic 2-nucleon collisions similar to the cascade model. Due to these features, AMD is capable of obtaining not only the “expectation value” or “mean trajectory”, but “distributions” or “fluctuation” of observables can be obtained. We prepare the ground states of fissioning nuclei by the frictional cooling, which yielded the nuclear mass to accuracy of 50 keV/u. Then, each system is boosted symmetrically to split into 2 fragments. We calculated the total kinetic energy (TKE) and spins of the fission fragments. Dependence of the TKE on Z2/A1/3 of the fissioning system was found to be almost linearly increasing. We have also obtained orbital angular momenta of each fragment, their mutual orientation and their orientation with respect to the linear momenta. From this analysis, we can elucidate origin of the spins of fission fragments, either it is by the bending, wriggling, twisting or tilting motion. Furthermore, we have observed several ternary fission events, emitting tritons or 4He from the neck region, and average energy and angles of these ternary particles with respect to the fission axis were found to be in accord with experimental data.