Measurement of the Annihilation-in-Flight Cross Section at 0° for 8.5-Mev Positrons
- 15 January 1961
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 121 (2) , 605-609
- https://doi.org/10.1103/physrev.121.605
Abstract
The differential cross section at 0° for the annihilation in flight of 8.5-Mev positrons has been measured. The positrons were created in a thick Ta target which was bombarded by 20-Mev electrons from a linear accelerator. They were directed onto a Be target where annihilation occurred, and the annihilation photons were measured by use of a thick-crystal spectrometer. The measured value for the cross section is 1.3±0.2 barns/steradian per electron, which is in agreement with theory.Keywords
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