Hoeve, H. G.||Meyer, Axel (Professor of physics)||Bushnell, David L.
M.S. (Master of Science)
Department of Physics
Positron-electron annihilations in metals lead to the study of electron momentum distributions and determination of Fermi surfaces. The correlated gamma rays created in the annihilation process are detected by scintillation counters scanned over fine angles and show an angular dependence proportional to the kinetic energies of the electrons. The free electron theory of metals is applied to a sample of polycrystalline copper and coincidence counting techniques are used to verify the theoretical predictions. The experimental setup consisted of vertical slit geometry at the detectors, fast-slow coincidence circuits, and automatic data controls. In addition, the sample was studied under vacuum conditions to compare the angular correlation curves with and without air annihilations.
Bay, Richard F., "Positron annihilation in copper" (1972). Graduate Research Theses & Dissertations. 4445.
47 pages, 23 unnumbered pages
Northern Illinois University
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