Abstract
Absolute cross sections for K ionization in thin foils of Ag, Sn, W, Au and Pb by negaton and positon impact have been measured with the aid of a β-ray spectrometer and a NaI(Tl) scintillation crystal. The negaton and positon energies have been varied from about 100 keV to 400 keV in the cases of Ag and Sn and from 200 keV to 550 keV in the cases of W, Au and Pb. Down to the lowest energies no systematic difference has been found between the values measured with negatons and positons, respectively. A brief discussion of the values obtained in comparison with earlier experimental and theoretical results will be given.
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