PROTON KNOCKOUT FROM O-16 AT 504 MEV AND LIMITATIONS OF THE DWIA

Analyzing powers have been calculated for the (p, 2p) reaction on O-16 at 504 MeV incident energy using a finite-ranged, relativistic DWIA f ormalism that includes both dynamical and kinematical recoil effects. A relativistic, Love-Franey parametrization is employed for the NN t-m atrix, and distortions are incorporated by means of relativistic, ener gy-dependent global optical potentials. The results are compared with the data for knockout from the 1S1/2, 1P1/2, and 1P3/2 bound states. T he calculated analyzing powers for P-state knockout agree fairly well with the data. For knockout from the 1S1/2 state, however, the DWIA re sults and the data are in significant disagreement. Further investigat ion has revealed a relationship between this disagreement and the spin -orbit parts of the phase-equivalent Schrodinger distortion potentials . Specifically, when the spin-orbit parts of the distortion potentials are omitted, the DWIA analyzing powers move closer to the data, parti cularly in their energy dependence. In so far as the presence and stre ngth of the spin-orbit potential is well established by other consider ations,this is not a solution to the disagreement, but it may provide a clue for future work.