Eur. Phys. J. A 13, 129-133 (2002)
Interaction at the barrier in the systems : Well-established facts and open questionsC. Signorini
Physics Department and INFN, via Marzolo 8, I-35131 Padova, Italy email@example.com
(Received: 1 May 2001)
The experimental data relative to the interaction for the systems at the Coulomb barrier are critically discussed and compared also with present theories. The break-up (BU) of the two loosely bound projectiles, , seems to influence the fusion process by "hindering" the fusion cross-sections; but, contrary to expectations, the halo structure has no influence, since no "enhancement" is evident from the existing data. Attempt to describe simultaneously all the system data: fusion, elastic scattering and BU, within a coupled-channel (CC) approach is only partly successful. It is important, from a theoretical viewpoint, to include in the CC formalism as well as possible the BU process both to continuum states as well as to unbound resonances. More accurate and well-focused experiments are also necessary to pin down this problem.
25.70.Jj - Fusion and fusion-fission reactions.
25.70.Mn - Projectile and target fragmentation.
24.10.Eq - Coupled-channel and distorted-wave models.
© Società Italiana di Fisica, Springer-Verlag 2002