Spin-orbit potential properties derived from measurements of analyzing powers for neutron scattering fromFe54andCu65

Angular distributions of the analyzing power $A_y(\ominus )$ have been measured for elastic scattering of neutrons from ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ and ${}_{}{}^{65}{}_{}{}^{}\mathrm{Cu}$ at 10 and 14 MeV and for inelastic scattering to the first $2^{+}$ state of ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ at 10 MeV. We have combined the results with previous measurements and analyses of the differential cross sections in the same energy range and have carried out new deformed optical model calculations where the major concern was to study the spin-orbit interaction. The need for an imaginary spin-orbit term $W_{\mathrm{SO}}\mathrm{}\left(r\right)\mathrm{}$ is discussed. The (n, n′) data are important in reducing an ambiguity found between the deformation ${\beta }_{\mathrm{SO}}$ of the real spin-orbit potential and the strength $W_{\mathrm{SO}}$ of the imaginary spin-orbit potential.