SPIN FLIP IN INELASTIC SCATTERING OF 19.6-MEV PROTONS FOR FE-54 AND FE-56

The spin-flip probability in the excitation of the first 2+ states in Fe54 and Fe56 has been studied at 19.6 MeV using the (p,p) coincidence technique. Differential cross sections have also been measured at this energy. The spin-flip data for Fe54 and Fe56 are quite similar, in contrast to asymmetry data from Saclay which show distinct differences between the two nuclei. Collective-model distorted-wave Born-approximation calculations generally underestimate the magnitude of the spin-flip probability at forward angles and predict too little structure. Simple microscopic-model calculations give improved agreement with the spin-flip data only when the terms arising from spin transfer of 1 are significant. These terms had little effect on the predicted cross sections and asymmetries. © 1969 The American Physical Society.