Nick KEELEY, CEA Saclay
Vendredi 30 Novembre 2007 à 14h30 - Salle des Séminaires
Studies of coupling effects on fusion and elastic scattering induced by beams of weakly bound exotic nuclei such as 6,8He, 11Be etc. have thus far focused on the influence of breakup. However, recent exclusive measurements for 6He + 209Bi found that at near-barrier energies the large total reaction cross sections observed for this system are dominated by one and two neutron stripping reactions. Although a large cross section is no guarantee of a significant effect, coupling to single neutron stripping reactions is found to have an important influence on the near-barrier total fusion and elastic scattering for those exotic nuclei classed as "halo" or "skin" systems, which appears to be unique to this type of nucleus. Examples are presented for several halo or skin nuclei plus the stable weakly bound nucleus 6Li.
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