Positronium formation at low temperatures: The role of trapped electrons

T. Hirade, F.H.J. Maurer, Morten Mostgaard Eldrup

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    Measurements have been carried out of electron spin densities (by electron spin resonance technique) and positronium (Ps) formation probability as functions of Co-60 gamma-irradiation dose in poly(methyl methacrylate) and linear poly(ethylene) at 77 K. We observe a linear relationship between the enhancement of the Ps formation and the density of trapped electrons in both polymers. This clear correlation strongly supports the previous suggestion by the authors that the increase in Ps formation with time (that has been observed at low temperatures for a number of polymers) can be explained as a reaction of free positrons with trapped electrons produced by the previously injected positrons. (C) 2000 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalRadiation Physics and Chemistry
    Volume58
    Issue number5-6
    Pages (from-to)465-471
    ISSN0969-806X
    DOIs
    Publication statusPublished - 2000
    Event6th International workshop on positron and positronium chemistry (PPC 6) - Tsukuba, Japan
    Duration: 7 Jun 199911 Jun 1999
    Conference number: 6

    Conference

    Conference6th International workshop on positron and positronium chemistry (PPC 6)
    Number6
    CountryJapan
    CityTsukuba
    Period07/06/199911/06/1999

    Keywords

    • Positronium
    • Trapped electrons
    • Low temperature
    • Gamma-irradiation
    • Visible light
    • Polymer

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