Zero-degree cross sections have been measured for the ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(p,n${)}^{11}$C reaction at bombarding energies of ${\mathit{E}}_{\mathit{p}}$=160, 200, 494, 644, and 795 MeV. In addition, spectra have been obtained at laboratory scattering angles of 3° and 5° at 494 MeV, and the transverse spin-flip probability at zero degrees has been measured for ${\mathit{E}}_{\mathit{p}}$=160 MeV. These data are used to obtain estimates of the Gamow-Teller transition strength to final states in ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ up to an excitation energy of ${\mathit{E}}_{\mathit{x}}$≃14 MeV. The uncertainty (1 standard deviation) in the extracted transition strengths is estimated to be in the range (2–8)%. Measured cross sections for the first four excited states in ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ have been compared to distorted-wave impulse approximation calculations. In this comparison, no evidence is found in the cross-section data for certain effects associated with knock-on exchange and noncentral interactions.

• Received 2 April 1990

DOI:https://doi.org/10.1103/PhysRevC.42.935