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Positronium formation from porous silica in backscattering and transmission geometries

  • Søren L. AndersenEmail author
  • Rasmus R. Johansen
  • Jakob B. Overgaard
  • Johan K. Mortensen
  • Kristoffer K. Andersen
  • Heine D. Thomsen
  • Mikkel D. Lund
  • Jacques Chevallier
  • Helge Knudsen
  • Ulrik I. Uggerhøj
Regular Article
Part of the following topical collections:
  1. Topical issue: Electron and Positron Induced Processes

Abstract

The Aarhus positron beam line is utilised to measure the positronium formation fraction from porous silica thin films created by the Glancing Angle Deposition technique. The highest formation fraction found from these studies in a backscattering geometry is (57.7 ± 1.0)% in good agreement with other measurements. In transmission mode, the maximum positronium output is found to be (12.5 ± 0.5)%. These are the first measurements of positronium formation in transmission of a porous silica thin film, a starting point for future attempts to optimise the positronium formation in transmission.

Keywords

Normal Thickness Porous Silica Formation Fraction Transmission Geometry Carbon Foil 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Søren L. Andersen
    • 1
    Email author
  • Rasmus R. Johansen
    • 1
  • Jakob B. Overgaard
    • 1
  • Johan K. Mortensen
    • 1
  • Kristoffer K. Andersen
    • 1
  • Heine D. Thomsen
    • 1
  • Mikkel D. Lund
    • 1
  • Jacques Chevallier
    • 1
  • Helge Knudsen
    • 1
  • Ulrik I. Uggerhøj
    • 1
  1. 1.Department of Physics and AstronomyAarhus UniversityAarhus CDenmark

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