Two-neutron removal cross sections of sup(11)Li-projectiles

We investigate the interplay of the nuclear and Coulomb interaction in the fragmentation of relativistic sup(11)Li-projectiles incident on several targets. The sup(11)Li nucleus is assumed to have a cluster-like structure, with a (bound) di-neutron system coupled to a sup(9)Li-core in a s-state. It is shown that, while the Coulomb contribution can be fairly well described in such model, the obtained nuclear cross sections show markedly differences with the experimental data. But, since the separation of the Coulomb and the nuclear contribution is theoretical in principle, this comparison points out ambiguities in the analysis of the experimental data. (author)