Reaction-cross-section measurements of the neutron-rich isotopes 9,8,11Li at about 80 MeV/u

Total interaction cross sections have been measured for 8Li on C and Pb targets, for 9Li on C, Al, Cu, Sn and Pb targets as well as for 11Li on C, Sn and Pb targets. For each beam, we also used a plastic scintillator as target. The measurements with the scintillator targets are used to extract reduced nuclear radii of the lithium isotopes. These radii are then used for the calculation of the nuclear part of the total cross section for the other targets. The total electromagnetic-dissociation (EMD) cross sections have been deduced and are compared to different models. A strong target-charge-dependent EMD cross section is confirmed for 11Li. In the 9Li case, a large EMD cross section for high-Z targets has been observed for the first time. The EMD cross sections of both, 9Li and 11Li, may be understood by the giant-dipole-resonance model. (orig.)