Abstract
The reaction dynamics of collisions involving halo or weakly bound nuclei, at energies around the Coulomb barrier, can be strongly affected by the structure of such nuclei. Very strong entrance channel effects have been observed on various reaction pocess such as, elastic scattering, fusion and direct reactions when comparing collision induced by the 6 He and 11 Be halo nuclei with the ones induced by their cores 4 He and 10 Be. Collisions induced by the stable weakly bound nuclei 6 Li, 7 Li show also some peculiarities in comparison to the ones induced by well bound nuclei; coupling with the break-up channel is in fact very important in reproducing low energy data. In this contribution an overview of our present understanding of the discussed topic will be given along with the discussion of some new preliminary results.
Highlights
The study of nuclear collisions around the Coulomb barrier induced by halo and, more in general, weakly bound nuclei such as the stable 6Li, 7Li, 9Be, has been widely investigated over the last twenty years
The present results suggest that, in order to study fusion below the barrier in collisions induced by weakly bound nuclei on medium mass targets, the simple integration of the H.R. yield is not giving the total fusion (TF) cross-sections since direct processes may give an important contribution to the cross-section
In this paper experimental results concerning the study of elastic scattering and reactions for halo and stable weakly bound nuclei around the Coulomb barrier have been summarized
Summary
The study of nuclear collisions around the Coulomb barrier induced by halo and, more in general, weakly bound nuclei such as the stable 6Li, 7Li, 9Be, has been widely investigated over the last twenty years. A complete theoretical description of such collisions requires a reaction theory which includes all of the structure and dynamic effects. This is partially done in Continuum Discretized Coupled Channels (CDCC) calculations. Coupling with excited states of the core have been included in the CDCC in the case of collisions induced by the 1n-halo 11Be [2]. Fusion reactions in collisions induced by weakly bound nuclei are complicated by the fact that, owing to the large breakup probability, in addition to complete fusion (CF) one can have a non negligible contribution of incomplete fusion (ICF) following breakup of the projectile or transfer see e.g. Fusion reactions in collisions induced by weakly bound nuclei are complicated by the fact that, owing to the large breakup probability, in addition to complete fusion (CF) one can have a non negligible contribution of incomplete fusion (ICF) following breakup of the projectile or transfer see e.g. [3, 4, 33]
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