The ${\mathrm{N}}^{14}(p, n){\mathrm{O}}^{14}$ reaction has been investigated at 30, 60, and 150 degrees in the laboratory system by the method of proton recoils in thick nuclear emulsions. The energy of the incident protons was 17.3±0.1 Mev, and the thickness of the melamine target was 0.2 Mev. The results indicate a ground-state $Q$ value of -6.03±0.2 Mev, yielding a mass defect for ${\mathrm{O}}^{14}$ of 12.2 Mev, in good agreement with beta-decay results. The data also indicate levels in ${\mathrm{O}}^{14}$ at excitation energies greater than 5.5 Mev.

• Received 14 January 1954

DOI:https://doi.org/10.1103/PhysRev.94.409