Positron lifetimes of polycrystalline metals: a positron source correction study

S. McGuire, D. J. Keeble

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    Positron lifetime measurements have been made on a series of polycrystalline metals with atomic numbers varying from 13 to 82, using positron sources deposited on Ni, Al, and Kapton support foils. Bulk positron lifetimes for Al, Ni, Zr, In, and Pb are reported. The results support previous assignments of monovacancy lifetimes for Ag, Ta, and Pb. A method for obtaining the extrinsic positron lifetime components due to the radionuclide source is developed, and the experimentally determined source lifetime components are studied as a function of the sample atomic number. The Z dependence of the source foil component intensities were fitted using known expressions for positron backscatter and multiple scattering within the source sample geometry, neglecting backscatter from the foil. The foil material positron absorption coefficients were obtained and found to be comparable with the results of previous transmission experiments.
    Original languageEnglish
    Pages (from-to)103504
    Number of pages1
    JournalJournal of Applied Physics
    Volume100
    Issue number10
    DOIs
    Publication statusPublished - 2006

    Keywords

    • Positron
    • Positron absorption
    • Polycrystalline metals

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