Angular distributions and integrated cross sections have been measured for protons scattered elastically and inelastically from nitrogen. A broad peak, about 1 MeV wide, centered near 9 MeV, has been found in the elastic cross section without a corresponding rise in the cross section in any of the inelastic channels. The angular distribution suggests that this peak is a $p$-wave scattering. Broad peaks in inelastic channels (about 0.5 MeV wide) were observed near 10 MeV for protons leading to the second excited state of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, and at 10.7 and 11.3 MeV for protons producing the fourth and sixth excited states. None of these peaks has a counterpart in the elastic scattering. They are probably caused by the production of intermediate states. Corresponding to the 9-MeV elastic proton resonance, we have found a broad resonance (0.4 MeV wide) in the elastic scattering of neutrons from nitrogen at 5.3 MeV. This resonance has a peak cross section of 0.5 b, which requires that the ratio of the neutron width to the total width be near unity. The nonelastic cross section does not show a resonance at this energy.

• Received 17 June 1968

DOI:https://doi.org/10.1103/PhysRev.174.1221