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- W2046113359 abstract "Abstract The absolute positron and electron fluxes from Pb targets irradiated by bremsstrahlung have been observed at angles between 21° and 74° and energies between 50 and 170 Mev. The fluxes from aluminum were observed at 29.2°, and shown to agree closely with theory when the (rather small) effects of finite nuclear size are accounted for. The positron to electron ratios of aluminum suggest a direction for improvements on the first Born approximation calculation of large angle pair production. By use of several target thicknesses the fluxes from Pb have been separated into (1) large angle pair production and (2) scattering of pair particles originally produced at 0°. The observed scattering of positrons and electrons is believed to be largely elastic, and on this assumption absolute scattering cross sections have been obtained. The pair flux and scattering cross sections vary much less rapidly with energy and angle for positrons than for electrons. The squared form factor for positron scattering also varies less rapidly than for electron scattering, indicating less nuclear screening for positrons than for electrons. A similar conclusion is reached for pair production. The Pb +/− ratios, when extended to low energy, are consistent with theoretical results." @default.
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- W2046113359 date "1957-08-01" @default.
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- W2046113359 title "Scattering of high-energy positrons and electrons, and large angle pair production, in lead" @default.
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