Unique potentials for the elastic scattering of 350 MeV ⁷Li from ¹²C and ²⁸Si

Differential cross sections for the elastic scattering of 350 MeV ⁷Li from ¹²C and ²⁸Si have been measured. The characteristics of the angular distributions are very similar to those of 318 MeV ⁶Li scattering from the same targets, with diffractive oscillations at the forward angles and smooth exponential falloff, attributed to the dominance of far-side scattering, at the larger angles. The peak-to-valley ratios of the oscillatory structure are similar to those for ⁶Li, indicating that the ⁷Li ground-state quadrupole moment has no discernible effect on the cross sections. Like the ⁶Li data, the ⁷Li data define unique phenomenological optical-model potentials. Double-folding model potentials calculated from fundamental nucleon-nucleon interactions also provide reasonably good fits to the experimental data.