Abstract
The transmission of liquid hydrogen for photons has been measured in the energy range 155 Mev to 255 Mev. An electron synchrotron was used as the radiation source and a magnetic pair spectrometer served as the photon detector. The total cross section of hydrogen for photons in the energy interval is nearly constant and has an average measured value of 18.7 ± 0.4 millibarns/atom. The objective of the experiment was to obtain a measure of the cross section for pair production in the field of the free electron. An analysis of the data indicates that the pair production cross section in the field of the electron is smaller by 0.5 ± 0.4 millibarn/electron than the pair production cross section in the field of the unscreened proton.
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