Abstract

The elastic scattering of 16O on 16O has been measured at 22MeV/u in a large angular range up to θ cm=61° with high accuracy. Besides the Fraunhofer diffractive patterns at forward angles a clear oscillatory structure is observed at large angles. It is shown in a semi-classical analysis that this structure is due to a rainbow interference of two refractive amplitudes (the second Airy maximum is identified). These data show a nuclear rainbow structure for the first time in heavy-ion scattering ( A>6) with unambiguous clarity.

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