Sub-Barrier Fusion with Exotic Nuclei

Interest in the mechanism of near- and sub-barrier fusion has been renewed, with the advent of radioactive beam facilities, due to the specific properties of unbound and weakly bound beams, such as extended neutron densities, low-lying continuum, and very low energy break-up thresholds. It is expected that these properties will appreciably affect fusion, as well as other reaction channels like breakup. We discuss the role played by these properties in barrier and sub-barrier fusion of weakly bound and unstable nuclei. The data are compared to calculations performed within the coupled channels and continuum discretized coupled channels schemes.