The excitation curve of the elastic scattering of protons by O
18 is analyzed with a phase shift analysis based on the
R-matrix dispersion theory. Resonance energy
ER(
LAB), total angular momentum and parity
Jπ, total resonance width
Γ, proton and alpha particle partial widths
Γp,
Γα are determined and tabulated for seven resonance levels of the compound nucleus, F
19 in the excitation energy range between 8.5–9.5 MeV.
The two-level approximation to the
R matrix is applied to analyze the complicated shape of the excitation curve due to the two interfering broad levels of the same spin and parity, 680 and 846 keV resonances. The whole excitation curve in the proton energy range between 600 and 1450 keV except at small resonance anomalies is well reproduced by using the resonance phase shift due to the above-mentioned 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 the target thickness and the beam energy spread is discussed.
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