The Annihilation of Positrons in Flight

Journal Article · Tue Aug 01 04:00:00 EDT 1961 · European Physical Journal. A

DOI:https://doi.org/10.1007/BF01679801· OSTI ID:4808879

Kilian, Peter

The differential cross section at 0 deg for annihilation in flight of positrons was measured with foils of lucite, AL Cu, Ag, Sn, Au, and Pb. Positrons from Cu/SUP 64/ and Co/SUP 56/with energies of 400, 600, 800, and 1000 kev were selected means of a magnetic spectrometer of the Kofoed-Hansen type, and the annihilation was detected in a telescope consisting of three scintillation counters. The experimental results were compared with theoretical values computed from the two-quantum cross section by taking into account the effect of multiple scattering of the positrons. The agreement is good for light elements within a statistical accuracy of l0%. For heavy elements the experimental value was found to be 15% greater than the theoretical value which perhaps could be attributed to the one-quantum annihilation.

• Research Organization: Universitat, Gottingen, Ger.
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-004721
• OSTI ID: 4808879
• Journal Information: European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 4 Vol. 164; ISSN 1434-6001
• Publisher: Springer
• Country of Publication: Country unknown/Code not available
• Language: German

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