2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 13, 129-133 (2002)

Interaction at the barrier in the systems $\chem{^{9,10,11}Be+{}^{209}Bi}$: 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 $\chem{^{9,10,11}Be+{}^{209}Bi}$ at the Coulomb barrier are critically discussed and compared also with present theories. The break-up (BU) of the two loosely bound projectiles, $\chem{^{9,11}Be}$, seems to influence the fusion process by "hindering" the fusion cross-sections; but, contrary to expectations, the $\chem{^{11}Be}$ halo structure has no influence, since no "enhancement" is evident from the existing data. Attempt to describe simultaneously all the $\chem{^{9}Be+{}^{209}Bi}$ 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.

PACS
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