STATISTICAL SIMULTANEOUS MULTIFRAGMENTATION MODEL FOR HEAVY-ION COLLISIONS WITH ENTRANCE CHANNEL CHARACTERISTICS

Based on the fireball model and the spectator-participant picture, a s tatistical simultaneous multifragmentation model is developed for heav y ion induced reactions, with the entrance channel characteristics tak en into account. This model has the density as the only parameter and it predicts the excitation energy, the temperature, and the frgmentati on cross section, etc., once the incident energy, the projectile, and the target nuclei are specified. As a first application, it has been a pplied to the central collision data taken at National Superconducting Cyclotron Laboratory on the Ar-40+Sc-45 reaction at incident energies ranging from 35 to 115 MeV/A. The study brings out the similarity in the characteristics of high energy proton induced and medium energy he avy ion induced reactions. It is observed that with rise of bombarding energy, the onset of simultaneous multifragmentation occurs at some e nergy between 50 and 60 MeV/A.