Abstract:
The experimental data relative to the interaction for the systems 9, 10, 11Be + 209Bi at the Coulomb barrier are critically discussed and compared also with present theories. The break-up (BU) of the two loosely bound projectiles, 9, 11Be, seems to influence the fusion process by “hindering” the fusion cross-sections; but, contrary to expectations, the 11Be halo structure has no influence, since no “enhancement” is evident from the existing data. Attempt to describe simultaneously all the 9Be + 209Bi 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.
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Received: 1 May 2001 / Accepted: 4 December 2001
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Signorini, C. Interaction at the barrier in the systems 9, 10, 11Be + 209Bi: Well-established facts and open questions. Eur Phys J A 13, 129–133 (2002). https://doi.org/10.1140/epja1339-24
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DOI: https://doi.org/10.1140/epja1339-24