Positron lifetime studies in some crystals

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Abstract
Positron lifetime measurements in some single crystals have been made with 0.200 ns (fwhm) prompt time resolution and 4*104: 1 peak-to-background ratio. In general, the decay spectra displayed essentially a single exponential. The intensity I2 of the long component was found to be less than or equal to 1% in practically all cases and was assigned to source sample effects. No difference in lifetime was observed between n type and p type crystals. Measurements on X ray irradiated samples do not show any change in the tau 1 lifetime values.