The known angular distribution of the ${\mathrm{C}}^{13}(p, p^{\prime }\gamma ){\mathrm{C}}^{13}$ 3.68-Mev gamma rays is not sufficient to determine uniquely the spin and parity of the 11.74-Mev ${\mathrm{N}}^{14}$ level for the case of arbitary channel-spin mixing. To resolve this ambiguity the angular distribution of the inelasticity scattered protons has been measured. Of the previous possibilities, $J^{\pi }=1^{+}, 2^{\pm }, \mathrm{and} 3^{-}$, the assignment $1^{+}$ is selected. A new level is found at 11.82 Mev in ${\mathrm{N}}^{14}$ having a width of about 100 kev, and decaying through the 3.09-Mev level in ${\mathrm{C}}^{13}$. An angular distribution of the inelasticity scattered protons from this new level shows strong interference effects.

• Received 16 December 1960

DOI:https://doi.org/10.1103/PhysRev.122.897