Numerical results of angular cross sections of electron pair production in a point-Coulomb potential

Numerical results of angular electron pair-production cross sections are given for the $\gamma$-ray sources ${}_{}{}^{60}{}_{}{}^{}\mathrm{Co}$ and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Tl}$. Cross sections are obtained analytically for a point-Coulomb potential, using an exact partial-wave formulation. Angular distributions are essentially unaffected in shape by the screening effects, as shown by Tseng and Pratt's calculations, so our curves can be useful to experimentalists. Moreover, they are computed at the tip region of the spectrum where screening effects are almost negligible.