The exit channels for elastic and alpha particles have been detected for ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ bombardment on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ over the energy range $E_{\mathrm{lab}}=45\mathrm{}-60.0$ MeV. Extensive statistical analyses of the data show evidence for nonstatistical structure (or "resonances"). Some of these structures are correlated in the two exit channels, especially one prominent structure at $E_{\mathrm{c}.\mathrm{m}}=22.4\mathrm{}$ MeV. The reaction mechanism is discussed, and all the evidence is consistent with a quasimolecular resonance formed by the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ entrance channel nuclei.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$), (${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$), (${}_{}{}^{14}{}_{}{}^{}\mathrm{N},\alpha$), $E=45.0\mathrm{}-60.0$ MeV; measured $\sigma \mathrm{}\left(E\right)\mathrm{}$ at ${\theta }_{\mathrm{lab}}=8\mathrm{}°$ for $\alpha$ and $\sigma \mathrm{}\left(E\right)\mathrm{}$ at ${\theta }_{\mathrm{lab}}=15\mathrm{}°,30°$ for ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$; statistical and Hauser-Feshbach analysis. Natural target. Resolution 130 keV for $\alpha$, 400-700 keV for ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$. Discussion of reaction mechanism.

• Received 15 December 1980

DOI:https://doi.org/10.1103/PhysRevC.23.2035