科研之友
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摘要
Recent experimental results for the fusion of the proton-halo system B-8+Ni-58 are discussed. A strong enhancement is observed both below and above the barrier. This is qualitatively different from the usual sub-barrier enhancement observed for many heavy-ion systems. Arguments are given that relate the enhancement to a static halo effect directly associated to the extended size of the proton-halo state. A simple single-barrier model is proposed which describes the fusion cross sections in terms of a maximum angular momentum for fusion, L-f. It is shown that a linear energy dependence for L-f gives a surprisingly good description of the experimental fusion excitation function not only for B-8+Ni-58 but also for the neutron-halo systems He-6+(Bi-209, Zn-64). The model is also applied to several weakly bound systems.
- 出版日期2012-1-5
