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-By using the improved quantum molecular dynamics(IQMD),we have stu-died the influences of items such as the nucleon-nucleon(N-N)collision cross sectionwith or without the medium effect,the momentum dependent interactions(MDI),theequation of state(EOS)and the aggregating method for fragments on the multifrag-mentation process of heavy ion collisions with different beam energies.It is found thatmultifragmentation distribution patterns,the collective flows of fragments and singleparticles,the collision number,and the nuclear matter density all depend strongly on theN-N cross section,the momentum dependent interactions and the nuclear equation ofstate;especially,these dependences are associated with beam energies.However,thefragment multiplicity distribution patterns depend very weakly on the equation of state.
-By using the improved quantum molecular dynamics (IQMD), we have stu-died the influences of items such as the nucleon-nucleon (NN) collision cross section section with or without the medium effect, the momentum dependent interactions (MDI), the state of state (EOS) and the aggregating method for fragments on the multifragmentation process of heavy ion collisions with different beam energies. It is found that multifragmentation distribution patterns, the collective flows of fragments and singleparticles, the collision number, and the nuclear matter density all depend strongly on the N-N cross section, the momentum dependent interactions and the nuclear equation of state; especially, these dependences are associated with beam energies. Still, the fragment multiplicity distribution patterns depend very weakly on the equation of state.