The ${\mathrm{N}}^{14}(\alpha , \alpha ){\mathrm{N}}^{14}$ and ${\mathrm{N}}^{14}(\alpha , p){\mathrm{O}}^{17}$ differential cross sections have been measured for $\alpha$-particle bombarding energies from 2.0 to 3.8 Mev. A differentially pumped gas scattering chamber was used. The ${\mathrm{N}}^{14}(\alpha , \alpha ){\mathrm{N}}^{14}$ differential cross sections were measured at center-of-mass angles of 170.8°, 140.6°, 125.1°, and 91.0°. Resonances were observed at 2.351, 2.370, 2.767, 2.868, 2.870, 3.080, 3.576 Mev and ∼3.67 and ∼3.71 Mev.

The ${\mathrm{N}}^{14}(\alpha , p){\mathrm{O}}^{17}$ differential cross sections were measured for $\alpha$-particle bombarding energies from 2.7 to 3.8 Mev at center-of-mass angles of 169.7°, 135.6°, 119.0°, and 84.7°. Resonances in the ${\mathrm{N}}^{14}(\alpha , p){\mathrm{O}}^{17}$ differential cross section were observed at $\alpha$-particle bombarding energies of 2.868, 3.080, and 3.69 Mev.

• Received 21 July 1958

DOI:https://doi.org/10.1103/PhysRev.112.1210