Abstract

Experimental study of positon straggling in thin absorbers has been performed with the aid of a Siegbahn-Slätis intermediate-image spectrometer mounted with a 22Na source. The energy of the incident positons is chosen as 300 keV. Targets used are aluminium, nickel, tin, tantalum and lead with thicknesses up to about 40 mg/cm 2. The most probable energy losses of positons in traversing the absorbers show good agreement with the Rohrlich-Carlson theory when the absorbers are thin enough, but for rather thick absorbers the experimental results fail to fit to the theory. It has also been found that the straggling distributions agree well with the theoretical values calculated from the Blunck-Leisegang theory.

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