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On Energy and Angular Distributions of Electrons in Triplet Production

The differential cross section of electron pair production in the field of free electrons (triplet production) is derived from the cross section for electron-positron bremsstrahlung exact to lowest order of perturbation theory. It is used to compute energy and angular distributions of the outcoming electrons. The results are compared with previous calculations. In particular, the accuracy of the momentum distribution according to the Borsellino approximation is discussed.