Energy-Loss of Positrons in Foils

H. Schneider, I. Tobehn, M. Rückert Strahlenzentrum der Universität Giessen, Leihgesterner Weg 217, 6300 Giessen, Germany U. Brinkmann and R. Hippler Fakultät für Physik, Universität Bielefeld, Universitätsstrasse 25, 4800 Bielefeld 1, Germany

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The Giessen slow positron source TEPOS delivers intense beams in the energy range between some eV and 6 keV; with postacceleration up to 80 keV. Results for remoderation are described shortly. Further the energy-losses of positrons with incident energy of 6-20 keV through thin aluminium foils were measured. Cross sections for K- and L-shell ionization of thin silver and gold targets by positron and electron impact have been determined at projectile energies of 30-70 keV. The experimental results are presented in detail; they are confirmed by calculations in plane-wave-Born approximation which include an electron exchange term and account for the deceleration or acceleration of the incident projectile in the nuclear field of the target atom.

DOI: 10.12693/APhysPolA.83.375 PACS numbers: 07.77.+p, 29.25.-t, 34.80.Dp