Angular Distributions of High Energy Gamma Rays from the F¹⁹(p, γ)Ne²⁰ Reaction

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The reaction F¹⁹(p, γ)Ne²⁰ was studied for proton energies from 550 to 1500 keV. The 1322 keV resonance reported previously was not observed. The angular distributions of the gamma rays from Ne²⁰ compound states corresponding to the E_p=669 and 1425 keV resonances to the first excited state were found to the isotropic within 2% in both cases. The angular distribution of the gamma ray to the first excited state of Ne²⁰ at E_p=1090 keV was found to be W(θ)=(1±0.028)+(0.363±0.051)P₂(cosθ)−(0.019±0.069)P₄(cosθ). From this result the spin and parity of the 13.91 MeV state of Ne²⁰ was determined to be 2⁻.