“Neck” Formation and Fragmentation in Intermediate Energy Heavy-ion Collisions

Abstract：

Under different impact parameters, the collision system of 30 MeV/u ⁴⁰Ca+⁴⁰Ca is investigated in terms of the QMD model. It is shown that the number of EMFs is largest at impact parameter b=6 fm, which is due to the formation of "neck" in the collision process. It is also found that, in the process of the formation of "neck," the growth of the relative density fluctuation of the reaction system is very slow and the saturation value is small, which imply the character of the shape instability.