Positron annihilation in thermally quenched potassium chloride

Journal Article · Sat May 01 04:00:00 EDT 1976 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.13.3715· OSTI ID:7352553

Dannefaer, S; Dean, G W; Hogg, B G

Positron annihilation lifetime and Doppler-broadened spectra have been obtained for thermally quenched KCl. It is found that internal consistency between the results of the two techniques is achieved when lifetime spectra are decomposed into four components. Using a simple statistical model for the annihilation of positrons it is deduced that the formation energy of Schottky defects is 2.1 +- 0.2 eV and further, that positrons trapped at vacancies have a lifetime of about 0.34 nsec. The two longest-lived components with lifetimes 0.77 +- 0.05 and 4.4 +- 0.02 nsec are shown to arise from annihilation of positronium. The positronium yield increases from about 16% at T < 150 degreeK to about 25% at T > 250 degreeK, the temperature region investigated being 90--296 degreeK. From Doppler-broadened spectra it is deduced that positronium is confined within a space of diameter 2 A. (AIP)

• Research Organization: Department of Physics, University of Winnipeg, Winnipeg, Canada
• OSTI ID: 7352553
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 13:9; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

640303* -- Atomic
Molecular &amp; Chemical Physics-- Positronium
Muonium
&amp; Muonic &amp; Mesic Atoms &amp; Molecules
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METAL COMPOUNDS
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CHARGED-PARTICLE TRANSPORT
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DOPPLER BROADENING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HALIDES
HALOGEN COMPOUNDS
INTERACTIONS
LEPTONS
LIFETIME
LINE BROADENING
MATHEMATICAL MODELS
POINT DEFECTS
POSITRONIUM
POSITRONS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
RADIATION TRANSPORT
SCHOTTKY DEFECTS
STATISTICAL MODELS
VACANCIES