ISOSCALING IN NECK FRAGMENTATION

摘要

Production of intermediate mass fragments (IMF) has been studied in semi-peripheral ~(124)Sn (35 A MeV) + ~(64)Ni and ~(112)Sn (35 A MeV) + ~(58)Ni reactions. Our recently proposed new method of an analysis of the neck-like fragmentation processes that provides information on the IMFs time sequence and time scale is reviewed. Isotopic analysis of so characterized IMFs gives evidence for neutron enrichment of mid-velocity fragments. A clear isoscaling behavior is found despite the short emission time scale. Evolution of the isoscaling parameters from semi-peripheral to central collisions is discussed.