Excitation functions and angular distributions of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(p,{\alpha }_0){}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ for bombarding energies of 9.0 through 12.0 MeV have been measured in steps of 50 keV from 10 through 160°. Prominent structures are noted near excitations of 16.2, 17.2, and 17.8 MeV in ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ and are observed to be composed of many sub-structures. Legendre polynomial fits to the angular distributions have been made. Corresponding structures are noted in the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^3{}_{}{}^{}\mathrm{He},{\alpha }_0){}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ reaction and comparisons are made with the $\alpha$-particle core-excited threshold-state model which had been applied to ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$.

[NUCLEAR REACTIONS ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(p,{\alpha }_0)$, $E=9.0-12.0\mathrm{}$ MeV; ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ deduced resonances. $\theta =10-{160}^{\circ }$, $\Delta \theta ={10}^{\circ }$, $\Delta E=50\mathrm{}$ keV.]

• Received 1 October 1973

DOI:https://doi.org/10.1103/PhysRevC.9.576