Elastic and Inelastic Scattering of 28.5 MeV Alpha Particles by Medium-Weight Nuclei

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Elastic and inelastic scattering of 28.5 MeV alpha particles by Ni⁶⁰, Ni⁵⁸, Ti⁴⁸, Co⁵⁹ and Al²⁷ has been studied. The angular distributions of the prominent group from the 2⁺ first excited state and the 3⁻ “anomalous” group for even nuclei were fitted by calculations based on Blair model. The angular distributions of the 4⁺ groups near 2.5 MeV in Ni⁶⁰, near 2.5 MeV in Ni⁵⁸ and near 3.3 MeV in Ti⁴⁸ were found to have intermediate phase between the corresponding elastic distribution and the corresponding first 2⁺ inelastic distribution. On the other hand, the angular distributions of the 2⁺ groups near 3.1 MeV in Ni⁶⁰, near 3.0 MeV in Ni⁵⁸ and near 2.4 MeV in Ti⁴⁸ were found to be almost exactly out of phase with the corresponding elastic distributions.
Large cross sections of the inelastic alpha scattering to the 2.21– and 3.0–MeV states in Al²⁷ suggest that these states are the members of a K^π=5⁄2⁺ rotational band based on the ground state.