Pair-Production in Different Elements by -Rays
- 1 August 1949
- journal article
- Published by IOP Publishing in Proceedings of the Physical Society. Section A
- Vol. 62 (8) , 499-504
- https://doi.org/10.1088/0370-1298/62/8/304
Abstract
The production of electron pairs on bombardment of Pb, Pt, Sn, Ag and Cu by γ-rays from 200 mg. of Ra and its equilibrium products has been investigated. 1,200 photographs were taken for each element and the yield was 100 pairs in Pb, 85 in Pt, 72 in Sn, 63 in Ag and 50 in Cu. The distribution of energy of the positrons in Pb and Pt follows the shape of the theoretical curve of Bethe and Heitler, but the position of the maximum of the energy distribution curves in Sn, Ag and Cu shows a discrepancy with that to be expected theoretically. The theoretical difference between the average energies of the positrons and electrons in the elements studied, when plotted against Z, is consistently higher than the experimental, though both can be approximately represented by straight lines. The angular distribution of the positrons and electrons with respect to the incident γ-rays agrees with the theory.Keywords
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