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Title: Temperature dependence of positron trapping at voids in metals

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Department of Technical Physics, Helsinki University of Technology, SF-02150 Espoo 15, Finland
OSTI Identifier:
6153824
Resource Type:
Journal Article
Journal Name:
Phys. Rev., Sect. B. Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 19:3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; CRYSTAL DEFECTS; POSITRONS; TRAPPING; ANNIHILATION; DISLOCATIONS; NEUTRON BEAMS; TEMPERATURE DEPENDENCE; VACANCIES; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BASIC INTERACTIONS; BEAMS; CRYSTAL STRUCTURE; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; INTERACTIONS; LEPTONS; LINE DEFECTS; METALS; NUCLEON BEAMS; PARTICLE BEAMS; POINT DEFECTS; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Nieminen, R.M., Laakkonen, J., Hautojaervi, P., and Vehanen, A. Temperature dependence of positron trapping at voids in metals. United States: N. p., 1979. Web. doi:10.1103/PhysRevB.19.1397.
Nieminen, R.M., Laakkonen, J., Hautojaervi, P., & Vehanen, A. Temperature dependence of positron trapping at voids in metals. United States. doi:10.1103/PhysRevB.19.1397.
Nieminen, R.M., Laakkonen, J., Hautojaervi, P., and Vehanen, A. Thu . "Temperature dependence of positron trapping at voids in metals". United States. doi:10.1103/PhysRevB.19.1397.
@article{osti_6153824,
title = {Temperature dependence of positron trapping at voids in metals},
author = {Nieminen, R.M. and Laakkonen, J. and Hautojaervi, P. and Vehanen, A.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.19.1397},
journal = {Phys. Rev., Sect. B. Condens. Matter; (United States)},
number = ,
volume = 19:3,
place = {United States},
year = {1979},
month = {2}
}