Positron lifetimes in some ionic compounds

Abstract Positron lifetime measurements in some ionic compounds like sulphates and hydroxides are reported. The results show that positrons annihilate in these compounds with two lifetimes: τ 1 ≈ 0.3 nsec and τ 2 ≈ 1.5 nsec. The data seem to support the possibility of positronium formation in these compounds.