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    Re-emission of slow positrons from tungsten at elevated temperatures

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    Date
    2002-06-21
    Author
    Al-Qaradawi, I. Y.
    Coleman, P. G.
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    Abstract
    A series of measurements have been made on the dependence of the intensity and energy spectrum of slow positrons re-emitted from polycrystalline tungsten foil held at temperatures of up to 500 °C. Irrespective of target history, no sharpening of the energy spectrum of re-emitted positrons was observed as the remoderator temperature was increased. Further, a steady decrease in the apparent re-emitted positron intensity was observed, attributed primarily to the increase in positronium formation, as the temperature of the foil was increased from 20 to 500 °C. It is concluded that maintaining a moderator or remoderator at elevated temperatures in standard positron beam systems has no beneficial consequences for the quality or intensity of the beam produced. Reasons for this are discussed. © 2002 Elsevier Science B.V. All rights reserved.
    URI
    https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0037150615&origin=inward
    DOI/handle
    http://dx.doi.org/10.1016/S0169-4332(02)00108-3
    http://hdl.handle.net/10576/49482
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    • Mathematics, Statistics & Physics [‎786‎ items ]

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