Abstract
Secondary beams of4He and6He were produced through the transfer reactions with the 18.5 MeV/u11B and 35.5 MeV/u7Li primary beams. The fusion-fission cross sections have been measured for the4,6He +209Bi reactions at energies Ecm>1.5*Bfus. In the present experiment it was found that the fission excitation function for the neutron rich nuclei6He is significantly higher than for the4He nuclei.
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The authors express their gratitude to Dr. N.I.Tarantin for assistance in the experiment.
The authors acknowledge the support of the RFBR (Project 93-02-3701).