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Abstract

Angular distributions of cross sections and analyzing powers have been measured for 18O(p, p) 18O and 18O(p, p 1) 18O ∗(1.98 MeV) for proton energies between 6.1 and 16.6 MeV. The measurement were crarried out in 25 keV intervals between 6.1 and 8.0 MeV, and in 100 keV intervals between 8.0 and 16.6 MeV. Although the general appearance of the angular distributions changes quite smoothly with energy above about 8 MeV, structure is evident in the backangle excitation functions up to 14 MeV. A phase-shift analysis of the elastic scattering data yielded resonance parameters for 25 levels in 19F in the excitation enrgy region 13.8−21.4 MeV. A large fraction of these levels have odd parity, and the energies of the 1 2 − and 3 2 − levels coincide closely with peaks seen in the 19F photonuclear yield curves. A simple model involving proton single-particle states coupled to the 2 1 +; and 3 1 − levels of 18O is able to account for some features of the observed structure. The energy-averaged elastic and inelastic scattering data for E p > 12 MeV agree reasonably well with the spherical optical model and the DWBA, respectively, as well as with coupled-channels calculations.