Kt. Brinkmann et al., RESIDUE EXCITATION-FUNCTIONS FROM COMPLETE FUSION OF O-16 WITH AU-197AND PB-208, Physical review. C. Nuclear physics, 50(1), 1994, pp. 309-316
Evaporation residue excitation functions and alpha-multiplicities from
complete fusion of O-16 with Au-197 and Pb-208 have been measured fro
m the fusion threshold up to 140 MeV incident energy. The data allow t
he conclusion that strongly overdamped motion cannot be dominant at en
ergies in the vicinity of the fusion barrier below E almost-equal-to
50 MeV. At excitation energies above 50 MeV the residue cross section
for O-16 + Pb-208 is much greater than predicted from the statistical
model with conventional parametrizations. The enhancement is not expla
ined by incorporating dynamical effects into the analysis. An alternat
ive suggestion based on deexcitation-chain dependent fission barriers
is discussed.