Trapping model for thermal and nonthermal positrons in metals

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.40.2537· OSTI ID:6027253

Gramsch, E; Lynn, K G

In order to correct the discrepancies of the simple two-state trapping model currently being used to explain the temperature dependence of positron annihilatoin in metals, we have modified the standard trapping model to implicitly include nonthermal trapping of positrons in vacancies and divacancies. A positron-energy-loss function and energy-dependent trapping rates were used to calculate the mean lifetime and intensity of the trapped and untrapped positrons. We have fitted this model to the lifetimes for aluminum measured by Jackman /ital et/ /ital al/. Results obtained for the formation enthalphy of vacancies and divacancies show the feasibility of the model to fit the experimental data.

• Research Organization: Physics Department, Brookhaven National Laboratory, Upton, New York 11973-6000 (US)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6027253
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 40:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
METALS
POINT DEFECTS
POSITRONS
TEMPERATURE DEPENDENCE
TRAPPING
VACANCIES