Gamma Decay of the 7.57-MeV Level ofN15

The ${\mathrm{C}}^{12}(\alpha , p\gamma ){\mathrm{N}}^{15}$ reaction was studied using particle-gamma coincidence techniques and the 22-MeV alpha-particle beam of the Indiana University cyclotron. The 7.57-MeV level of ${\mathrm{N}}^{15}$ is observed to decay by gamma emission to either the 5.28- or 5.30-MeV level. An upper limit of 10% is placed on the intensity of the ground-state branch. This information, together with the results of other experiments, suggests a spin and parity assignment of ${\frac{5}{2}}^{+}$ or ${\frac{7}{2}}^{+}$ for the 7.57-MeV level, which is consistent with shell-model predictions.