Abstract
Halo nuclei are extreme nuclear states consisting of one or more weakly-bound valence nucleons spatially decoupled from a tightly bound nuclear core. The weakly bound nature of the halo dominates the reaction probability, but the specific reaction mechanisms depend also on the core and target nuclei. Despite of the inherent complexity of the reaction process, simple two-body models and direct reaction theories can be used to extract useful information of the structure of the halo nucleus and its dynamics. These ideas are discussed using selected experiments of Coulomb barrier reactions with one- and two- neutron halo systems.
Highlights
Nuclear systems, such as 6He, 11Li, 11Be, and 15C are known to have an extended neutron distribution, the socalled neutron halo [1]
The appearance of haloes is strongly correlated with the existence of weakly bound valence nucleons, which increases the tunnelling probability through the effective nuclear potential
Coulomb barrier energies (CBE) are interesting to study halo dynamics as the relative velocity is comparable to the nucleon motion in the impinging nuclei, which enhances the correlation between the relative motion and the internal degrees of freedom
Summary
Nuclear systems, such as 6He, 11Li, 11Be, and 15C are known to have an extended neutron distribution, the socalled neutron halo [1]. The appearance of haloes is strongly correlated with the existence of weakly bound valence nucleons, which increases the tunnelling probability through the effective nuclear potential. This effect tends to de-localise the valence nucleons, extending the nuclear density up to large distances and producing the so-called “neutron halo”. Strong couplings can be induced between the elastic channel and the inelastic, transfer, breakup and fusion reactions and, for halo nuclei, the states lying in the continuum play a very important role [3]. CBE provide a good energy range to probe the influence of the nuclear halo on reaction dynamics, testing few-body nuclear models and investigating the role of nucleon-nucleon correlations. The contributions of the couplings to the relevant reaction channels, often due to the dipole component of the interaction (dipole polarizability) produce a strong reduction of the elastic yield around the
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