An intermediate-type resonance of width ${\Gamma }_{\mathrm{c}.\mathrm{m}.\mathrm{}}=130\mathrm{}\pm 25$ keV has been observed in the excitation functions of the $n$, $p$, $d$, and $\alpha$-particle exit channels at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=12.77\mathrm{}$ MeV in the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ reaction. The energy of the resonance as well as its probable spin $J=8\mathrm{}\hslash$ are in good agreement with the predictions obtained from the semiclassical expression for the grazing orbit.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, n)$, $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=10.7-15.9\mathrm{}$ MeV; measured $\sigma \mathrm{}\left(n\right)\mathrm{}$; ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, p)$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, d)$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, \alpha )$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$), $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=12.43-13.93\mathrm{}$ MeV; measured $\sigma \mathrm{}\left(p\right)\mathrm{}$, $\sigma \mathrm{}\left(d\right)\mathrm{}$, $\sigma \left(\alpha \right)$, $\sigma \left({}_{}{}^{16}{}_{}{}^{}\mathrm{O}\right)$.

• Received 27 September 1976

DOI:https://doi.org/10.1103/PhysRevC.15.834