Level Structure inO15from the Proton Bombardment ofN14

Abstract

Absolute cross sections for elastic scattering, ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(p, p){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, and inelastic scattering, ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(p, p_1){}_{}{}^{14}{}_{}{}^{}\mathrm{N}_{}^{*}{}_{}{}^{}$, from the first excited state were measured for proton bombarding energies between 3.7 and 5.67 MeV at laboratory angles of 67.5°, 85.9°, 105.8°, 123.7°, 135.0°, and 157.5° in order to determine level parameters of excited states in ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$. Complete angular distributions were measured at selected energies in this region and limited angular distributions were obtained for inelastic scattering, ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(p, p_2){}_{}{}^{14}{}_{}{}^{}\mathrm{N}_{}^{*}{}_{}{}^{}$, from the second excited state, and for the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}(p, \alpha ){}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ reaction. Scattering anomalies were observed at proton bombarding energies of 3.88, 3.90, 3.99, 4.13, 4.20, 4.575, 4.58, 4.63, 4.74, 4.78, 4.86, 5.02, 5.18, and 5.55 MeV, corresponding to excited states in ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ at 10.91, 10.93, 11.01, 11.14, 11.21, 11.56, 11.565, 11.61, 11.71, 11.75, 11.83, 11.97, 12.12, and 12.47 MeV. Resonances were analyzed using a multilevel $R$-matrix approximation. Qualitative and semiquantitative fits were made to these data and resonance parameters were determined for many of the observed levels.