Polarization Dependence of the Integrated Bremsstrahlung Cross Section

The differential cross section for bremsstrahlung derived in the previous paper is integrated over the direction of the emerging electron. It is found that regions of appreciable polarization occur near both the low energy and high energy ends of the photon spectrum. Calculations are performed for the polarization dependence of the radiation for incident electrons of about 0.1, 0.5, 2.5 Mev with and without approximate shielding corrections calculated for aluminum. The polarization dependence of the differential cross section for pair production and of the cross section integrated over either the electron or positron direction is obtained from the results for bremsstrahlung by the well-known procedure of changes from positive to negative energy state.