Sensitivity of orthopositronium annihilation to density fluctuations in ethane gas
Thesis/Dissertation
·
OSTI ID:5003831
The annihilation rates of orthopositronium (o-Ps) and free positrons and positronium formation fractions have been measured in gaseous ethane at seven temperatures between 295 and 377 K for densities in the range 1.2-286 amagat. The pick off quenching rate of o-Ps is observed to vary with temperature at low densities of ethane. The observed behavior of the o-Ps annihilation rates with density and temperature is interpreted in terms of density fluctuations in ethane gas. A simple theoretical model is developed which explains the observed annihilation behavior reasonably well at those temperatures and densities where density fluctuations are small. The annihilation rates of flow-energy positrons indicate the formation of positron-ethane collision complexes and self-trapping of positrons in clusters of ethane molecules. The o-Ps yields appear to be independent of temperature and show a strong dependence on the density of the gas.
- Research Organization:
- Texas Univ., Arlington (USA)
- OSTI ID:
- 5003831
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
654001* -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKANES
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
COLLISIONS
DATA
DENSITY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ETHANE
EXPERIMENTAL DATA
FERMIONS
FLUIDS
GASES
HYDROCARBONS
INFORMATION
INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POSITRONIUM
POSITRONS
TEMPERATURE DEPENDENCE
TRAPPING
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKANES
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
COLLISIONS
DATA
DENSITY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ETHANE
EXPERIMENTAL DATA
FERMIONS
FLUIDS
GASES
HYDROCARBONS
INFORMATION
INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POSITRONIUM
POSITRONS
TEMPERATURE DEPENDENCE
TRAPPING