Temperature dependence of positron trapping at voids in metals

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1979
Major/Subject
Mcode
Degree programme
Language
en
Pages
1397-1402
Series
Physical Review B, Volume 19, Issue 3
Abstract
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.
Description
Keywords
aluminum, positrons
Other note
Citation
Nieminen, Risto M. & Laakkonen, J. & Hautojärvi, P. & Vehanen, A. 1979. Temperature dependence of positron trapping at voids in metals. Physical Review B. Volume 19, Issue 3. 1397-1402. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.19.1397.