THE EFFECTS OF MEAN-FIELD AND 2-BODY COLLISION ON THE RADIAL EXPANSION ENERGY

The expansion energy has been studied by using BUU model based on the Skyrme interaction to obtain the information of equation of state. The effects of radial expansion energy on the mean field and two-body col lision have been discussed. The results are that at intermediate energ y heavy ion collision the radial expansion energy is sensitive to effe ctive mass m and insensitive to the incompressibility. The reasonable effective mass m = 0.8 m is obtained by comparison of expansion ener gy with experiment. Cross section has a little influence on the expans ion energy and the effect of cross section on expansion energy increas es with increasing beam energy.