Abstract
Elastic, evaporation residue, fission and light-particle cross-section excitation functions have been measured for 12C+ 209Bi at incident energies near and just above the Coulomb barrier. A sizeable direct 8Be transfer process has been established at incident energies near the Coulomb barrier. The “massive transfer” mechanism as previously suggested for reactions at incident energies well above the Coulomb barrier has difficulties in explaining the observed 8Be transfer cross sections. An S-wave fission barrier of 6–7 MeV is indicated for 220−1Ac from a statistical-model analysis of the evaporation residue excitation function. It is possible to account for the total reaction cross section obtained from the optical-model analysis of the elastic data by the measured reaction channels.
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