Fusion and Direct Reactions of Halo Nuclei at Energies around the Coulomb Barrier

Details Fusion and Direct Reactions of Halo Nuclei at Energies around the Coulomb Barrier Fusion and Direct Reactions of Halo Nuclei at Energies around the Coulomb Barrier

2007-02-16

arxiv.org/abs/nucl-ex/0702038v1

Prog.Part.Nucl.Phys.59:579-630,2007

Physics

Nuclear Physics

Nuclear Experiment

52 pages, review paper, accepted for publication in "Progress in Particle and Nuclear Physics"

Scientific paper

10.1016/j.ppnp.2007.02.002

The present understanding of reaction processes involving light unstable nuclei at energies around the Coulomb barrier is reviewed. The effect of coupling to direct reaction channels on elastic scattering and fusion is investigated, with the focus on halo nuclei. A list of definitions of processes is given, followed by a review of the experimental and theoretical tools and information presently available. The effect of couplings on elastic scattering and fusion is studied with a series of model calculations within the coupled-channels framework. The experimental data on fusion are compared to "bare" no-coupling one-dimensional barrier penetration model calculations. On the basis of these calculations and comparisons with experimental data, conclusions are drawn from the observation of recurring features. The total fusion cross sections for halo nuclei show a suppression with respect to the "bare" calculations at energies just above the barrier that is probably due to single neutron transfer reactions. The data for total fusion are also consistent with a possible sub-barrier enhancement; however, this observation is not conclusive and other couplings besides the single-neutron channels would be needed in order to explain any actual enhancement. We find that a characteristic feature of halo nuclei is the dominance of direct reactions over fusion at near and sub-barrier energies; the main part of the cross section is related to neutron transfers, while calculations indicate only a modest contribution from the breakup process.

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