Messung des wirkungsquerschnitts für K-ionisierung durch negatonen- und positonenstoß

摘要: Abstract Absolute cross sections for K ionization in thin foils of Zr, Sn, W and Pb by negaton positon impact have been measured with the aid a β-ray spectrometer NaI(Tl) scintillation crystal. The or energies varied from 240 keV to 1440 keV. In all cases values obtained are much larger than those given non-relativistic theory. No systematic difference has found between negatons positons, respectively. According measurements exponent Z section varies ν = 2.60±0.20 2.00±0.30 electron