Distorted wave Born approximation calculation of pair production cross section for 12.5Â MeV photon

We present in this communication the theoretical results of our calculation in distorted wave Born approximation (DWBA) in point Coulomb potential of the differential and total electron-positron pair production cross section by 12.5 MeV photons on different targets (Z=1, 30, 50, 68, 82 and 92). We also present differential pair production cross-section in the tip region (E-=1.008mc2) for photon energies 5.0-40.0 MeV for a large number of targets. We compare the interpolated DWBA pair production cross section with the experimental electron-positron pair creation cross section in the energy range 5.0-12.5 MeV on Ta and Bi.