Abstract
The excitation curve of the elastic scattering of protons by O18 is analyzed using a phase shift analysis based on the R-matrix dispersion theory. Resonance energy E/sub R.(LAB), total angular momentum and parity J pi , total resonance width GAMMA , proton and alpha partial widths GAMMAp, GAMMAalpha are determined and tabulated for seven resonance levels of the compound nucleus, F/sup 19/, in the excitation energy range between 8.5 and 9.5 Mev. The two-level approximation to the R matrix is applied to analyze the shape of the excitation curve from the 680 and 846 kev resonances. The whole excitation curve in the proton energy range between 600 and l450 kev, except at small resonance anomalies, is reproduced using the resonance phase shift from the two 1/2+ resonances, the hard sphere scattering phase shift of s and p wave, and the Coulomb scattering amplitude. All other weakly excited resonances with small level widths are analyzed by the one-level approximation, assuming that they are superposed on the general trend of the excitation curve. Each resonance parameter is uniquely determined. A method of treating the finite energy resolution due to target thickness and beam energy spread is discussed. (auth)
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