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

Boyle, G. J., Casey, M. J. E., White, R. D. and Mitroy, Jim (2014). Transport theory for low-energy positron thermalization and annihilation in helium. Physical Review A - Atomic, Molecular, and Optical Physics,89(2 - Article No. 022712):1-9.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 0 times in Scopus Article

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Title Transport theory for low-energy positron thermalization and annihilation in helium
Author Boyle, G. J.
Casey, M. J. E.
White, R. D.
Mitroy, Jim
Journal Name Physical Review A - Atomic, Molecular, and Optical Physics
Publication Date 2014-02-28
Volume Number 89
Issue Number 2 - Article No. 022712
ISSN 1050-2947   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-84897729079
Start Page 1
End Page 9
Total Pages 9
Place of Publication United States
Publisher American Physical Society
HERDC Category C1 - Journal Article (DIISR)
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 〈Zeff〉 for positrons injected into gaseous helium. Similarly, the variation of 〈Zeff〉 versus E/n0 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 〈Zeff(t)〉 for helium.
DOI http://dx.doi.org/10.1103/PhysRevA.89.022712   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Fri, 29 Aug 2014, 16:10:43 CST by Anthony Hornby