Abstract

Elastic 3He scattering on 40Ar, 39K, 41K, 40Ca and 42Ca was investigated at E( 3He) = 28 MeV . A comparison of the scattering on neighbouring nuclei shows differences in backward angle cross sections up to one order of magnitude. This variation is clearly outside the domain of the standard optical model. This anomalous backward angle scattering is discussed in connection with similar anomalies observed in elastic α-particle scattering.

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