Energy Levels ofNa23from theNe22(p, γ)Na23Reaction

The gamma-ray excitation function of the ${\mathrm{Ne}}^{22}(p, \gamma ){\mathrm{Na}}^{23}$ reaction for protons of energies in the range 500-900 kev has been measured. Narrow resonances at 636, 660, 854, 901, 933, and 943 kev were observed in agreement with earlier workers. The 660-kev and 943-kev resonances may be due to contaminants, but the remainder were assigned unambiguously to the above reaction, and their gamma-ray spectra examined. A detailed study, including angular distribution measurements, was made of the resonances at 636 and 854 kev. In all four resonances ground-state radiation was observed, and in the upper three radiation to the first excited state was found. A cascade through the 3.92-Mev level was observed in the 854-kev resonance. The results suggest that the first excited state has spin $\frac{5}{2}$, even parity; the 3.92-Mev level, $\frac{5}{2}$ or $\frac{7}{2}+$; the 9.40-Mev capture state ½-; and the 9.61-Mev capture state $\frac{3}{2}$, + or -.