Collisions induced by halo and weakly bound nuclei around the Coulomb barrier: experimental results at INFN-LNS

Abstract

The study of nuclear collisions involving halo or weakly bound nuclei, at energies around the Coulomb barrier, had a considerable interest in the last decade since the peculiar structure of such nuclei can deeply affect the reaction dynamics. In this paper will summarize some of the experimental results obtained by our group at INFN-LNS over the last years in collisions induced by the halo nuclei 6He and nBe and the stable weakly bound nuclei 6Li and 7Li. Very strong entrance channel effects have been observed in elastic scattering, fusion and direct processes comparing collision induced by the 6He and nBe halo nuclei with the ones induced on the same target by their cores 4He and 10Be. Collisions induced by the stable weakly bound nuclei 6Li, 7Li shows some peculiarities in comparison to the ones induced by well bound nuclei, such as absence of usual threshold anomaly in the optical potential and strong competition of complete fusion with incomplete fusion and transfer in the heavy residue production cross sections. Our experimental results are compared with the ones of other authors, in order to give an overview of our present understanding of the discussed topic.