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Positron annihilation in thermally quenched potassium chloride

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

Phys. Rev., B; (United States), 1976-05, Vol.13 (9), p.3715-3723

United States

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Título:
Positron annihilation in thermally quenched potassium chloride
Autor: Dannefaer, S. ; Dean, G. W. ; Hogg, B. G.
Assuntos: 640303 - Atomic, Molecular & Chemical Physics- Positronium, Muonium, & Muonic & Mesic Atoms & Molecules ; ALKALI METAL COMPOUNDS ; ANNIHILATION ; ANTILEPTONS ; ANTIMATTER ; ANTIPARTICLES ; ATOMIC AND MOLECULAR PHYSICS ; 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
É parte de: Phys. Rev., B; (United States), 1976-05, Vol.13 (9), p.3715-3723
Descrição: 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)
Editor: United States
Idioma: Inglês

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Positron annihilation in thermally quenched potassium chloride

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

United States

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