Publication Date

1972

Document Type

Dissertation/Thesis

First Advisor

Hoeve, H. G.||Meyer, Axel (Professor of physics)||Bushnell, David L.

Degree Name

M.S. (Master of Science)

Department

Department of Physics

LCSH

Positrons||Copper

Abstract

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.

Comments

Includes bibliographical references.||Includes illustrations.

Extent

47 pages, 23 unnumbered pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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