Temperature dependence of positron trapping at voids in metals
Finna-arvio
Temperature dependence of positron trapping at voids in metals
A1_nieminen_risto_m_1979.pdf
(Aalto-yliopisto - Aaltodoc)
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.
Tallennettuna:
Kieli |
englanti |
---|---|
Sarja | Physical Review B Volume 19, Issue 3 |
Aiheet | |
ISSN |
1550-235X (electronic) |
DOI | 10.1103/physrevb.19.1397 |