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Materials Characterization with Intense Positron Beams

  • I. J. Rosenberg (a1), R. H. Howell (a1), M. J. Fluss (a1) and P. Meyer (a1)

Abstract

We have developed an apparatus that provides a high flux, low energy, monoenergetic positron beam to investigate various processes which occur when a positron beam impinges on a metal surface, including annihilation at the surface, trapping in vacancies, and the emission of both fast and thermally desorbed positronium. We report here the first angular correlation of annihilation gamma-rays measurements and positronium time of flight experiments at a material surface. We applied a simple free electron model which explains the general trend of the data but differences due to the surface specific properties and the deviation from a free electron metal are evident.

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1. For a comprehensive review of positron beam measurements, see Positron Solid-State Physics, edited by Brandt, W. and Dupasquier, A., (North Holland, New York, 1983) and Positron Annihilation, edited by Paul G. Coleman, Suresh C. Sharma, and Leonard M. Diana (North Holland, New York, 1982).
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Materials Characterization with Intense Positron Beams

  • I. J. Rosenberg (a1), R. H. Howell (a1), M. J. Fluss (a1) and P. Meyer (a1)

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