Differential cross sections for pair production by photons on electrons

The cross section for pair production by unpolarized photons on free, unpolarized electrons is differential in four nontrivial variables. This cross section is integrated numerically over two or three of the variables, and various energy spectra and angular distributions are obtained. The calculations are restricted to low photon energies, below 5 MeV, where effects of recoil and exchange are important and may be observed.