Measurements of the differential cross section for the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(p,n${)}^{16}$F and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$(p,n${)}^{18}$F reactions are made at ${\mathrm{\theta }}_{\mathrm{lab}}$= 0°, 1°, 2°, 3°, 4°, 6°, and 8° with a bombardment energy of 494 MeV. Multipole decomposition methods based on the measured angular distributions are used to extract ΔL=0, ΔL=1, and ΔL=2 contributions to the cross sections. The summed Gamow-Teller strength B(GT) is computed for the excitation energy region 0–30 MeV in ${}_{}{}^{16}{}_{}{}^{}\mathrm{F}$, and 0–12.5 MeV in ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$. Difficulties with the decomposition methods are discussed.

• Received 22 February 1994

DOI:https://doi.org/10.1103/PhysRevC.49.3104