Influence of defects on positron transmission and annihilation in the lithium fluoride crystal
Journal Article
·
· Sov. Phys. - Solid State (Engl. Transl.); (United States)
OSTI ID:6465832
The positron implantation profile and the angular distribution of annihilation ..gamma.. quanta were determined for a lithium fluoride crystal under ..beta../sup +/ and ..gamma.. irradiation (/sup 22/Na source). The positron absorption coefficient of the irradiated crystal was ..cap alpha.. = 76.2 +- 1.5 cm/sup -1/. The angular distribution had a strong narrow component. After thermal bleaching of the crystal, ..cap alpha.. = 91.9 +- 1.5 cm/sup -1/, the narrow component made a smaller contribution to the angular distribution, and its half-width increased. The positron mobility was found to be ..mu.. = 18 +- 8 cm/sup 2/ x V/sup -1/ x sec/sup -1/. It is suggested that defects influence in two ways the fate of positrons in the lithium fluoride crystal: free positrons may be trapped by some defects (cationic vacancies) or annihilated in collisions with others (F centers). The defect concentration is estimated.
- Research Organization:
- State Pedagogical Institute, Birsk
- OSTI ID:
- 6465832
- Journal Information:
- Sov. Phys. - Solid State (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Solid State (Engl. Transl.); (United States) Vol. 26:5; ISSN SPSSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
360605 -- Materials-- Radiation Effects
ALKALI METAL COMPOUNDS
ANNEALING
CHANNELING
COLLISIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON-POSITRON COLLISIONS
FLUORIDES
FLUORINE COMPOUNDS
GAMMA RADIATION
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
IONIC CRYSTALS
IONIZING RADIATIONS
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
PHYSICAL RADIATION EFFECTS
POSITRON CHANNELING
POSITRON COLLISIONS
RADIATION EFFECTS
RADIATIONS
360603* -- Materials-- Properties
360605 -- Materials-- Radiation Effects
ALKALI METAL COMPOUNDS
ANNEALING
CHANNELING
COLLISIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON-POSITRON COLLISIONS
FLUORIDES
FLUORINE COMPOUNDS
GAMMA RADIATION
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
IONIC CRYSTALS
IONIZING RADIATIONS
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
PHYSICAL RADIATION EFFECTS
POSITRON CHANNELING
POSITRON COLLISIONS
RADIATION EFFECTS
RADIATIONS