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The annihilation of positrons in pure elements and chemical compounds

The angular correlation between annihilation quanta due to the decay of positrons in eleven different materials has been measured with anthracene scintillation counters. The materials studied were, the pure elements, Mg, S, Cu, Sn, Pt, and Hg, and the chemical compounds LiCl, KCl, CsCl, KF, and KI.
Calculations were performed to determine the effect of the geometry on the shape of the angular correlation curves. The effects of scattering were also investigated. The apparatus was tested by means of measurements on the γ-rays of Co⁶⁰ and Zn⁶⁵.
The centre of mass momentum distributions of annihilating pairs in copper, platinum and possibly mercury were found to be exponential in character and the mean centre of mass momentum obtained for copper was found to be in reasonable agreement with the results obtained by DeBenedetti and coworkers and by P. E. Argyle. The momentum distributions for the other materials were not found to be of a simple exponential form. The results suggest that there is a relation between the shape of the distribution curve and the outer electronic structure of an atom. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Identiferoai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/41405
Date January 1950
CreatorsGriffiths, George Motley
PublisherUniversity of British Columbia
Source SetsUniversity of British Columbia
LanguageEnglish
Detected LanguageEnglish
TypeText, Thesis/Dissertation
RightsFor non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.

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