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Positronium scattering from Kr and Xe at low energies

Mitroy, Jim and Bromley, Michael W. J. (2003). Positronium scattering from Kr and Xe at low energies. Physical Review A (Atomic, Molecular and Optical Physics),67(3):034502-1-034502-4.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 14 times in Scopus Article | Citations

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Title Positronium scattering from Kr and Xe at low energies
Author Mitroy, Jim
Bromley, Michael W. J.
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Publication Date 2003
Volume Number 67
Issue Number 3
ISSN 1094-1622   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0038193801
Start Page 034502-1
End Page 034502-4
Total Pages 4
Place of Publication College Park, United States
Publisher American Physical Society
Field of Research 0202 - Atomic, Molecular, Nuclear, Particle and Plasma Physics
0204 - Condensed Matter Physics
0205 - Optical Physics
HERDC Category C1 - Journal Article (DEST)
Abstract The scattering of orthopositronium from Kr and Xe is investigated with the fixed core stochastic variational method. The scattering lengths for Ps-Kr and Ps-Xe scattering in the fixed core approximation are 3.18a(0) and 3.82a(0), respectively. Inclusion of core-polarization potentials leads to a significant reduction in the scattering lengths. The Ps-Kr and Ps-Xe scattering lengths were 1.98a(0) and 2.29a(0) for polarization potentials that were tuned to an average of the model electron-atom and positron-atom scattering lengths for the respective atoms. Other choices of the polarization potential resulted in scattering lengths that could be larger by 0.3a(0) or smaller by 0.8a(0). The pick-off annihilation parameter (1)Z(eff) has also been computed as part of the analysis. The present values of (1)Z(eff) are about 3 to 10 times smaller than the accepted experimental values since short-range electron-positron correlations were ignored when the annihilation matrix element was evaluated.
Keywords stochastic variational method
transfer cross-section
annihilation
gases
hydrogen
xenon
atoms
ions
DOI http://dx.doi.org/10.1103/PhysRevA.67.034502   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Additional Notes Copyright by the The American Physical Society


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