A narrow, strongly excited state was observed in the ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}(\alpha ,p){}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ reaction at 23.288 MeV. This excitation energy is in agreement with peaks seen in ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}(p,{\pi }^{+}){}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}(e,e^{\prime }){}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ reactions. However, the ($p,{\pi }^{+}$) work indicates that this state may be a $3^{-}$, $T=2\mathrm{}$ state. The population of this level via the ($\alpha ,p$) reaction rules this out. Furthermore, weak coupling calculations suggest that the centroid of the $\left|{}_{}{}^{11}{}_{}{}^{}\mathrm{B}\otimes \nu \right(p_{\frac{1}{2}},d_{\frac{5}{2}}),\pi (d_{\frac{5}{2}})〉$ configuration lies very close to this energy. It is therefore more probable that this state has a spin and parity of $7^{+}$, $T=1\mathrm{}$ rather than a $3^{-}$, $T=2\mathrm{}$ assignment.

• Received 15 June 1988

DOI:https://doi.org/10.1103/PhysRevC.38.1958