Abstract
Experimental determinations of the absolute differential positronium-formation cross sections near ${0}^{\ensuremath{\circ}}$ for Ne, Ar, Kr, and Xe are presented and compared with theory. The degree of forward collimation, expressed by the ratios of the differential-to-integral positronium-formation cross sections, is also computed and compared with theories and other targets. Trends among targets and structures at low energies emerge when considered as a function of the reduced total energy.
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