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Positronium scattering from closed-shell atoms and ions

Mitroy, Jim and Ivanov, Igor A. (2002). Positronium scattering from closed-shell atoms and ions. Physical Review A (Atomic, Molecular and Optical Physics),65(1):012509-1-012509-12.

Document type: Journal Article
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Title Positronium scattering from closed-shell atoms and ions
Author Mitroy, Jim
Ivanov, Igor A.
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Publication Date 2002
Volume Number 65
Issue Number 1
ISSN 1094-1622   (check CDU catalogue open catalogue search in new window)
Start Page 012509-1
End Page 012509-12
Total Pages 12
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 He, Ne, Ar, Li+, Na+, and K+ is investigated with the fixed-core stochastic variational method. The scattering length for Ps-He scattering was 1.57a(0), a value consistent with the threshold cross sections derived from three positron lifetime experiments. The scattering lengths for the Ps-Ne and Ps-Ar systems were 1.55a(0) and 1.79a(0), respectively. That there was only a 15% variation among the scattering lengths is compatible with the experiment of Coleman et al. [J. Phys. B 27, 981 (1994)], who found the low-energy cross sections for He, Ne, and Ar to be about the same size. The scattering lengths for Ps scattering from Li+, Na+, and K+ were 12.9a(0), 28.5a(0), and -1.9a(0). The relatively small magnitude of the Ps-K+ scattering length strongly supports previous suggestions that the Ps-K+ system does not support a bound state. The annihilation parameter (1)Z(eff) has also been computed as part of the analysis. The present values of (1)Z(eff) are about 2.5-3 times smaller than the accepted experimental values since short-range electron-positron correlations were not taken into consideration when the annihilation matrix element was evaluated.
Keywords transfer cross-section
stochastic variational method
temperature rare-gases
few-body problems
drift velocities
low energies
argon atoms
neon atoms
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Additional Notes Copyright by the The American Physical Society

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