Eur. Phys. J. A 13, 129-133 (2002)
Interaction at the barrier in the systems
:
Well-established facts and open questions
C. Signorini Physics Department and INFN, via Marzolo 8, I-35131 Padova, Italy signorini@pd.infn.it
(Received: 1 May 2001)
Abstract
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
