Applied physics

, Volume 5, Issue 3, pp 231–238 | Cite as

Evidence for a ramsauer minimum in positron-argon collisions

  • K. F. Canter
  • G. R. Heyland
Contributed Papers
Received:
Accepted:

Abstract

The lifetime spectra are obtained for positrons annihilating in argon gas at room temperature and at lower temperatures of the order of 100 K. By suitably normalising and subtracting room temperature from low temperature lifetime spectra, certain features of the spectra which are determined by the momentum transfer cross-section for positron-argon collision are greatly enhanced. As a result, it is found that the cross-section must possess a well defined minimum below 3 eV in order to account for the observed effects.

Index Headings

Positron-argon cross-sections Cross-section measurements:e+-argon gas 
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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • K. F. Canter
    • 1
  • G. R. Heyland
    • 1
  1. 1.Department of Physics and AstronomyUniversity College LondonLondon

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