Measurements of $\sigma (\theta , E)$ are reported for ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$,${}_{}{}^8{}_{}{}^{}\mathrm{Be}$)${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$* reactions to the low lying $0^{+}$, $2^{+}$, $4^{+}$ and unresolved $3^{-}$, $1^{-}$ final states. The energy range is $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}\simeq 11.5 \mathrm{to} 18.6$ MeV with measurements at ∼ 86 keV intervals. Up to 38 angles between ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}=12\mathrm{}° \mathrm{and} 167°$ are measured for each energy. A large number of resonances are identified by their appearance over a broad range of forward and backward angles and by their energy correlation over exit channels. Many $J^{\pi }$ assignments are inferred from the behavior of back angle $\sigma \left(\theta \right)$ across the resonance. All $J$ values are from one to three units less than the optical model grazing angular momentum for the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ channel.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$)${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$*; measured $\sigma (\theta , E)$ to low-lying states for $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}\simeq 11.6-18.6$ MeV and ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}\simeq 12°-167\mathrm{}°$. Deduced resonant energies and $J^{\pi }$ values.

• Received 3 March 1980

DOI:https://doi.org/10.1103/PhysRevC.22.528