Positron annihilation in disordered binary alloys

Measurements of the concentration dependence of the form of the long slit angular distributions for solid solutions of the PbIn, MgIn, CuAl and CuNi alloy systems are reported. A simple theoretical model provides an interpretation of the results in terms of the spatial distribution of positron and electron density within the alloy, and suggests a basis for the qualitative prediction of positron behaviour in any alloy system.