A method for separating direct and compound nuclear reaction contributions to inelastic $\alpha$ scattering on spin 0 targets is proposed. It is based on the characteristic behavior of the parameters of the $\alpha -\gamma$ angular correlation function in a distorted-wave Born approximation and a Hauser-Feshbach model treatment. The method is applied to the reaction ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}(\alpha , {\alpha }^{\prime }\gamma )$.

NUCLEAR REACTIONS ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ ($\alpha , {\alpha }^{\prime }\gamma$), $E_{\alpha }=10, 16.5$ MeV. Measured differential cross sections and angular correlations. Determined direct and compound nuclear contributions.

• Received 19 November 1982

DOI:https://doi.org/10.1103/PhysRevC.27.1988