FRAGMENT EMISSION TIME-SCALE IN INTERMEDIATE-ENERGY HEAVY-ION COLLISIONS

Complete two-fragment velocity systematics have been measured over the entire range of fragmentation products for the system Fe-56 + Au-157 at 50 and 100 MeV per nucleon. Fragment emission lifetimes are estimat ed from the reduced velocity (V(rel) square-root Z1+Z2) correlation fu nctions by a direct comparison with results from a classical three-bod y trajectory calculation. Furthermore, we examine the validity of the reduced velocity, V(red), as a scaling parameter for constructing mixe d-fragment (Z1 not-equal Z2) correlation functions over the full measu red range (5 less-than-or-equal-to Z(i,j) less-than-or-equal-to 53) of fragment pairs excluding fission.