Evolution of reaction mechanisms in the light heavy-ion system

The quantum molecular dynamics method is used to study the details of reaction mechanisms and transitions among them in light heavy-ion systems. The outline of evolution of reaction mechanism is discussed by studying the incident-energy dependence of the fragment mass distribution in the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$${+}^{16}$O system. The calculated total cross sections of medium-mass fragments in the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$${+}^{12}$C system agree with data. The analysis of time variation of kinetic energies of nucleons relative to their parent clusters is shown to be very useful to clarify the reaction mechanisms. The calculated double differential cross sections of light fragments in the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$${+}^{12}$C system show good agreement with experiments. The average of cluster internal energies is found to saturate with regard to the increase of incident energy.