THE DYNAMICAL INGREDIENTS GOVERNING THE MULTIFRAGMENTATION PROCESS AND COLLISION DYNAMICS IN HEAVY-ION COLLISIONS

By simulating numerically the reaction dynamics of heavy ion collision s within the modified quantum molecular dynamics (MQMD), we have studi ed the influences of the nucleon - nucleon (n - n) collision cross sec tion with and without medium effect, momentum dependent interactions ( MDI), equation of state (EOS) and the aggregating method of fragments on the multifragmentation process of heavy ion collisions with differe nt beam energies. It is found that multifragmentation patterns of the final fragment distributions, the collective flows of fragments and si ngle particles, collision number and nuclear matter density depend str ongly on the n - n cross section and momentum dependent interactions a nd the nuclear equation of state, especially these dependences are ass ociated with beam energies. But the fragment multiplicity distribution patterns depend very weakly on the equation of state.