Abstract
Woods-Saxon optical-potential fits to recent measurements of 16O+ 16O elastic scattering at 350 MeV have been interpreted as providing clear evidence for a nuclear rainbow. Three model-independent potentials have also recently been found to reproduce these data. Two of them were indeed found to be members of a rainbow series, in which a distinctive minimum near 44° is the first or second Airy minimum of a rainbow pattern, but the scattering by the third (shallower) potential was less easy to interpret. We show here that this potential achieves its fit to the data by a different and somewhat unconventional mechanisms. This serves as a reminder that ambiguities in interpretation can persist, even with as extensive and accurate a data set as this measurement provides.
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