Temperature dependence of positron trapping at voids in metals

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We report positron-lifetime measurements in void-containing aluminum samples, which show strong temperature dependence for the positron trapping probability. A theory is presented for the positron motion and trapping in a three-dimensional array of large voids, which compares favorably with the experimental data. It is shown that at low temperatures the trapping is transition limited and strongly temperature dependent with a crossover to diffusion-limited and weakly-temperature-dependent behavior at high temperatures.


Original languageEnglish
Pages (from-to)1397-1402
Number of pages6
JournalPhysical Review B
Issue number3
Publication statusPublished - 1 Feb 1979
MoE publication typeA1 Journal article-refereed

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