Elastic scattering of polarized protons fromFe56in the giant resonance region ofCo57

The proton elastic scattering cross sections and analyzing powers for ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$ have been measured for proton energies from 8.0 to 17.0 MeV. Excitation curves were measured in 100 keV steps at eight angles from $E_p=9.3\mathrm{} \mathrm{to} 16.5$ MeV. Angular distributions of cross sections and analyzing powers were measured at 18 angles in ∼ 7.5° steps over the range of ∼ 20° to ∼ 150° in 1.0 MeV steps from 8.0 to 17.0 MeV. A phase shift analysis indicates that the $d_{\frac{5}{2}}$ partial wave has the most significant energy dependence in this energy region. It is shown that this energy dependence can be essentially accounted for by the presence of a single resonance with parameters consistent with those which would be expected for the giant dipole resonance of ${}_{}{}^{57}{}_{}{}^{}\mathrm{Co}$.