The Onset of Nuclear Structure Effects in Near-Barrier Elastic Scattering of Weakly-Bound Nuclei: ${}^6$He and ${}^6$Li Compared

Abstract

The elastic scattering of the halo nucleus ${}^6$He from heavy targets at incident energies near the Coulomb barrier displays a marked deviation from the standard Fresnel-type diffraction behavior. This deviation is due to the strong Coulomb dipole breakup coupling produced by the Coulomb field of the heavy target, a specific feature of the nuclear structure of ${}^6$He. We have performed Continuum Discretized Coupled Channels calculations for the elastic scattering of ${}^6$He and ${}^6$Li from ${}^{58}$Ni, ${}^{120}$Sn, ${}^{144}$Sm, ${}^{181}$Ta and ${}^{208}$Pb targets in order to determine the range of $Z_{\mathrm{T}}$ where this nuclear-structure specific coupling effect becomes manifest. We find that the strong Coulomb dipole breakup coupling effect is only clearly experimentally distinguishable for targets of $Z_{\mathrm{T}}\approx 80$.

10 pages with 3 figures

References in corpus (4)

• Four-body continuum-discretized coupled-channels calculations using a transformed harmonic oscillator basis
• Coupled-channels effects in elastic scattering and near-barrier fusion induced by weakly bound nuclei and exotic halo nuclei
• Improved di-neutron cluster model for 6He scattering
• Core Transitions in the Breakup of Exotic Nuclei

Cited by in corpus (4)

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• ${}^9$Be+${}^{120}$Sn scattering at near-barrier energies within a four body model
• Important Influence of Entrance Channel Reorientation Coupling on Proton Stripping