Electron distortion in quasifree (e,e′p) reactions

Effects of Coulomb distortion of the electron wave functions in the quasifree (e, e′p) reactions are investigated in DWBA. Electron waves are described by a high energy approximation. The coincidence cross section is calculated in a nonrelativistic approach based on the impulse approximation. Results are presented and discussed for different nuclei in different kinematical conditions. Coulomb distortion gives two different effects. The first one is to change the momentum transfer into an effective momentum transfer. This effect is dominant for light nuclei and decreases by increasing incident electron energy. The second one is the focusing of the electron wave in the nuclear Coulomb field. This effect, almost energy independent, is sizeable in medium and heavy nuclei. It increases the cross section and in some cases becomes very large.