Abstract
An experiment using a cloud chamber in a magnetic field of 6200 gauss to determine the average total cross section of the direct production of electron pairs in aluminum by high energy electrons generated in cascade showers and having energies larger than 30 Mev is described. After correction for the spurious events 8.1 electron tridents, which were produced actually by electrons, were found. This figure corresponds to a mean free path of 672 plus or minus 585 cm or an average total cross section of (0.25 plus or minus 0.22) x 10/sup - 25/ cm/sup 2/ for trident production. In the treatment of data, the elimination of spurious tridents was appropriately considered. The formulas of the total cross section derived by Bhabha and by Murota et al., were applied in accordance with the experimental conditions to compute the total cross section. Comparison between the theoretical and experimental values was made. The experiment is in fair agreement with the theory of Murota et al., while not in contradiction with that of Bhabha. (auth)
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