The (α,α^') reaction, at E_α=31 MeV, on Zn⁶⁸ and Zn⁷⁰ was studied with an over-all energy resolution of 70-120 keV. Angular distributions are presented. New 3^-, 4⁺, and 5^- assignments are made on the basis of distorted-wave Born-approximation (DWBA) calculations. Good angular distributions were obtained for double-excitation 2⁺ states at 1.88 MeV in Zn⁶⁸ and at 1.78 MeV in Zn⁷⁰. Fractionation of the octupole strength has been observed. Systematics of excitation energies and strengths are discussed for Zn⁶⁴, Zn⁶⁶, Zn⁶⁸, and Zn⁷⁰.
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Alster et al. (1971) studied this question.