HE-6+BI-209 FUSION-FISSION REACTION

Fission following the fusion of He-6 with a Bi-209 target has been stu died near the Coulomb barrier, at excitation energies of 32 and 34 MeV in the compound system. These new experimental data are in disagreeme nt with previous work which reported an anomalously large fusion-fissi on yield, when compared with He-4-induced fission of Bi-209 at similar excitation energies. In fact, the He-6-induced fusion-fission yield a ppears to be smaller than that for He-4, in qualitative agreement with conventional statistical model calculations.