Elastic and inelastic scattering excitation functions for ${}_{}{}^{52}{}_{}{}^{}\mathrm{Cr}$ and ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ by ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ have been measured. The inelastic data associated with ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ on common targets are very different. Optical model and distorted-wave Born approximation calculations indicate that multistep processes involving the projectile states are responsible.

NUCLEAR REACTIONS ${}_{}{}^{52}{}_{}{}^{}\mathrm{Cr}$, ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ (${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$), (${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$), $E=30-42\mathrm{}$ MeV; measured $\sigma \mathrm{}\left(E\right)\mathrm{}$. DWBA analysis, deduced optical parameters, $B\left(E2\mathrm{}\right)\mathrm{}$, ${\beta }_n$.

• Received 26 June 1978

DOI:https://doi.org/10.1103/PhysRevC.19.2073