Energy spectrum of electron pairs in a high energy photon-electron cascade

The energy spectrum of electron pairs generated in a high energy photon-electron cascade up to a depth of 1·5 c. u. was measured and the possible influence of the medium on the shape of the spectrum according to Landau-Pomeranuk-Ter Mikaelyan and Migdal was investigated. Two procedures were used for the analysis; no significant deviation from the Bethe-Heitler spectrum could be observed. Different ways of estimating the primary energy were applied; the resulting value, 2×10¹²eV, was accepted as the primary energy.

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, - 1,5 , - . ; - . ; 210¹² eV.

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The authors wish to thank Dr. Lanius for kindly lending them the necessary plate from the Berlin part of the I-stack.