The yield of 4.43-Mev gamma rays from the reaction ${\mathrm{N}}^{15}(p, \alpha \gamma ){\mathrm{C}}^{12}$ has been measured for proton energies between 800 kev and 4020 kev. A gas target, enriched to 61% in ${\mathrm{N}}^{15}$, was used. New resonances were observed at bombarding energies of 1985±20 kev, 3000±30 kev, 3300±35 kev, 3350±50 kev, and 3520±40 kev, with widths of 25±5 kev, 45±10 kev, 75±15 kev, 750±100 kev, and 100±25 kev, respectively. The width of the previously known resonance at 1650±15 kev was measured to be 65±10 kev. Angular distributions for the 4.43-Mev gamma rays were measured at eight energies, included all the observed resonances. Spin and parity assignments are made to the resonant states. The ${\mathrm{N}}^{15}(p, \gamma ){\mathrm{O}}^{16}$ yield was measured for proton energies between 850 kev and 3300 kev, but no new resonances were seen. The width of the known 1050-kev resonance was measured to be 125±25 kev.

• Received 7 January 1957

DOI:https://doi.org/10.1103/PhysRev.106.261