The cross section for the elastic scattering of protons by ${\mathrm{N}}^{14}$ has been measured at center-of-mass angles of 90°, 125°, 154°, and 160° for proton energies between 620 and 1820 kev. Anomalies were observed at 1054±3, 1544±6, 1737±4, and 1799±5 kev. If one assumes that the nonresonant cross section results from only $s$-wave potential scattering, the assignments $J=\frac{3}{2^{+}}$ at 1054 kev and $J=\frac{1}{2^{+}}$ at 1544 kev are deduced. Fitting of the 1737-kev anomaly has not been found possible if one assumes a pure $s$-wave background. This uncertainty in background also prevents a definitive analysis of the 1799-kev data. However, qualitative theoretical fits of the 1799-kev data are obtained for $p$-wave formation of either a $J=\frac{1}{2^{-}} or \frac{3}{2^{-}}$ state.

• Received 28 September 1956

DOI:https://doi.org/10.1103/PhysRev.105.219