Nuclear reactions induced by 156 MeV 6Li projectiles

Nuclear reactions induced by 156 MeV 6Li projectiles have been experimentally studied at the Karlsruhe Isochronous Cyclotron. Phenomenological analyses of elastic scattering reveal some features different from lighter complex ion scattering as well as from heavier ion (12C, 16O) scattering. Refined folding model descriptions with density dependent nucleon-nucleon interactions and including approximately one-nucleon exchange reproduce the elastic 6Li scattering cross sections successfully. Due to the low background in the excitation region up to 20 MeV inelastic 6Li scattering proves to be an excellent experimental tool for exploring strength and shape of the giant resonances. This is demonstrated by looking for different giant resonance components in 90Zr. The dominating reaction channel is the 6Li → α + d break-up. The large break-up probability of the 6Li projectile seems to lead to a particular reaction type: transfer of one fragment into highly excited states followed by compound nucleus deexcitation, thus implying cluster effects in preequilibrium emission processes. Experiments looking for this process are discussed. (author)