Transport theory for low-energy positron thermalization and annihilation in helium

Boyle, G.J., Casey, M.J.E., White, R.D., and Mitroy, J. (2014) Transport theory for low-energy positron thermalization and annihilation in helium. Physical Review A : Atomic, Molecular and Optical Physics, 89 (2).

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Abstract

A transport theory that explicitly incorporates loss of flux due to annihilating collisions is developed and applied to low-energy positron diffusion and annihilation. The use of more complete momentum transfer and annihilation cross sections for helium has resulted in improved descriptions of the time dependence of < Z(eff)> for positrons injected into gaseous helium. Similarly, the variation of < Z(eff)> versus E/n(0) for experiments where the annihilation region is immersed in an electric field is in closer agreement with experimental data. Inclusion of loss of flux due to annihilation was found to have a very small effect on the derived < Z(eff)(t)> for helium.

Item ID: 32941
Item Type: Article (Refereed Research - C1)
ISSN: 1094-1622
Funders: Australian Research Council (ARC)
Date Deposited: 30 Apr 2014 09:37
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 80%
02 PHYSICAL SCIENCES > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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