Complex Fragment Emission In The E/A=60-100 Mev N-14+(Nat)Ag,Au-197 Reactions

Excitation functions have been measured for complex fragments with Z = 3-15 emitted in collisions of E/A = 60, 80 and 100 MeV N-14 ions with targets of (nat)Ag and Au-197. The results are analyzed in terms of a three-source model: projectile fragmentation, non-equilibrium emission from the composite system, and statistical decay of an equilibrated heavy residue. Enhanced heavy fragment production is found for reactions with the (nat)Ag target above E/A greater-than-or-equal-to 60 MeV. Above E/A congruent-to 50 MeV the ratio of equilibrium to non-equilibrium cross sections is found to be nearly independent of bombarding energy. Fit-parameter systematics are presented.