Experiments at the Giessen source TEPOS with low energy positrons |
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Authors: | H Schneider I Tobehn M Rückert U Brinkmann R Hippler |
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Institution: | 1. Strahlenzentrum der Universit?t Giessen, Leihgesterner Weg 217, D-6300, Giessen, Germany 2. Fakult?t für Physik, Universit?t Bielefeld, Universit?tsstrasse 25, D-4800, Bielefeld 1, Germany
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Abstract: | The TEPOS facility at the Giessen LINAC delivers intense positron beams in the energy range between some eV and 6 keV; with
postacceleration up to 80 keV. Results for remoderation and positron storage will be discussed. Further the energy-loss of
positrons in thin aluminium foils at incident energies of 6–20 keV was measured. Cross sections for K- and L-shell ionization
of thin silver and gold targets by positron and electron impact were 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 (PWBA) which include
an electron exchange term and take into account the deceleration or acceleration of the incident projectile in the nuclear
field of the target atom. |
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