The reaction cross section for 8 B and 7 Be and the breakup cross section for 8 B on silicon have been measured for incident energies between 10 and 40 MeV/nucleon with a stack of silicon detectors. Secondary 8 B and 7 Be beams were obtained by use of the LISE spectrometer at GANIL. The stack of silicon detectors had the multiple purpose of slowing down the incident secondary beams, identifying the reaction products, and measuring their energy. The separate contributions of diffraction dissociation and absorption to the breakup have been determined. The parallel momentum distribution of 7 Be resulting from the breakup of 8 B has also been determined. The data are compared to theoretical calculations. ͓S0556-2813͑96͒06009-8͔

206 Pb( 6 He,2n) 210 Po, as well as for the transfer reactions on a 197 Au target with the formation of the 196 Au and 198 Au isotopes, with a beam dose about a factor of 10 higher and, in addition, at energies considerably lower than the Coulomb barrier of the reactions.

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Secondary beams of 4He and 6He were produced through the transfer reactions with the 18.5 MeV/u lib and 35.5 MeV/u 7Li primary beams. The fusion-fission cross sections have been measured for the 4.6He + 209Bi reactions at energies Ecm> l.5*Bfus . In the present experiment it was found that the fission excitation function for the neutron rich nuclei 6He is significantly higher than for the 4He nuclei.

No abstract