Elastic scattering of polarized protons fromFe56in the giant resonance region ofCo57

Abstract

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 ${E}_{p}=9.3 \mathrm{to} 16.5$ MeV. Angular distributions of cross sections and analyzing powers were measured at 18 angles in \ensuremath{\sim} 7.5\ifmmode^\circ\else\textdegree\fi{} steps over the range of \ensuremath{\sim} 20\ifmmode^\circ\else\textdegree\fi{} to \ensuremath{\sim} 150\ifmmode^\circ\else\textdegree\fi{} 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 $^{57}\mathrm{Co}$.NUCLEAR REACTIONS $^{56}\mathrm{Fe}(\stackrel{\ensuremath{\rightarrow}}{p},p)$; measured $\ensuremath{\sigma}(E,\ensuremath{\theta})$, $E=8\ensuremath{-}17$ MeV; measured $A(E,\ensuremath{\theta})$, $E=8\ensuremath{-}17$ MeV. Phase-shift analyzed. Deduced resonance parameters. Enriched targets.