For the reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$)${}_{}{}^8{}_{}{}^{}\mathrm{Be}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$ angular distributions have been measured at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=12.22, 12.57, 12.92, 13.17, 13.37, 13.77, 14.02, 14.23, 14.67, \mathrm{and} 15.07$ MeV. The cross sections in the range $12.5\le E_{\mathrm{c}.\mathrm{m}.\mathrm{}}\le 13.5$ MeV are much larger than the predictions of direct $\alpha$-transfer and/or statistical compound nucleus calculations. Resonance behavior at 13.2 MeV with width 650 keV is indicated. Interference effects between direct and one and two resonance amplitudes have been considered with the second resonance at 13.7 MeV being a well-known anomaly $J=8\mathrm{}$ is indicated for these two resonances.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$) ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$, $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=10-15\mathrm{}$ MeV, measured $\sigma \left(\theta \right)$; compared yield to DWBA and statistical model calculations; resonance phenomena at 13.15 MeV, 13.77 MeV, deduced spin-values.

• Received 20 April 1978

DOI:https://doi.org/10.1103/PhysRevC.19.2186