Pair Production by Electrons

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Abstract
Pair production by electrons was observed by measuring the positrons emitted from thin copper targets irradiated directly by the synchrotron electron beam (230±20 Mev energy). The positrons were produced in either of two ways: either (1) directly by the electron beam, or (2) through a double process in which bremsstrahlung was first produced which then materialized in pairs in the same target. By measuring the positron rate as a function of target thickness a direct comparison of the two modes of production was obtained. The thickness of copper from which the positron yield was the same for both processes was 0.0043±0.001 inch (0.0073±0.0017 radiation lengths). The positrons had about 0.80 of the energy of the incident electron beam.

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