Abstract
The positron annihilation process was experimentally studied in aqueous solutions of NaF, NaCl, NaBr, and NaI over a wide concentration range. Different annihilation channels and their contribution to the overall process depending on the nature and concentration of halide ions were identified. A model was proposed, which assumes that positrons and halide ions form complexes having different lifetimes. Calculations in terms of the model showed a good fit to the experiment; the probabilities of formation of different positron and positronium states and their lifetimes were evaluated.
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