Reaction mechanism for target-like products from Au-197 target bombarded with C-12 ions of energies above 100 MeV/u

Target-like products, that is,Au191-200, Pt185-200,and Ir183-195 from Au-19 7 target bombarded with C-12 ions at the energies of 180, 230, and 400 MeV/ u were measured by using off-line gamma-ray spectrometry combined with chem ical separation procedures. Spallation systematics by Rudstam reproduces we ll the measured cross sections for formation of platinum and iridium isotop es. It was found that the cross sections of gold nuclides increase with inc rease of the incident energy in the range studied and they are enhanced if compared with the reported proton-induced reaction of gold at a similar inc ident energy. It is suggested that the electromagnetic dissociation process plays a role for production of such gold nuclides.