Mutually consistent measurements of elastic proton scattering and resonance absorption show that the width of the 9.17 MeV level in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ ($\Gamma =135\mathrm{}\pm 8$ eV) is almost twice as large as the accepted literature value. The positive parity is unambiguously confirmed. The excitation energy is determined to be 9172.5±0.3 keV, based upon a cascade-crossover technique with a ${}_{}{}^{56}{}_{}{}^{}\mathrm{Co}$ source for calibration. The expected azimuthal asymmetry of the resonance fluorescence of the plane-polarized photons at this resonance is demonstrated quantitatively.

NUCLEAR REACTIONS ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$($p$,$\gamma$)${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ ($p$,$p$)${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ res. abs., ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ res. fluor., $E=1.75\mathrm{}$ MeV; measured $\sigma (E,E_p,\theta )$. ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ deduced levels $J$, $\pi$, $\Gamma$, levels. Enriched target.

• Received 9 December 1980

DOI:https://doi.org/10.1103/PhysRevC.24.2443