Fission Barriers at High Angular Momenta

Fission and evaporation-residue excitation functions for 170-340-MeV ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$+${}_{}{}^{109}{}_{}{}^{}\mathrm{Ag}$ have been analyzed with a code which treats multiple-particle emission with explicit angular-momentum dependence. It is found that the liquid-drop barriers must be reduced by 40% to reproduce experimental results, and that multiple-chance fission contributions are essential to the analysis.