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Calculation of electron-pair production by 7.5-MeV photons on Sn and U.

We present in this Brief Report the results of the distorted-wave Born approximation calculations of the electron-pair-creation cross section by 7.5-MeV photons on Sn and U. The results are compared with the cross sections obtained by using semiempirical formulas of Overbo (Phys. Lett. 71B, 412 (1977)) and of Maximon and Gimm (Natl. Bur. Stand. (U.S.). Internal Report No. 78-1456 (1978)) and the interpolated experimental data.