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Pick-off annihilation in positronium scattering from alkali-metal ions

Ivanov, Igor A. and Mitroy, Jim (2002). Pick-off annihilation in positronium scattering from alkali-metal ions. Physical Review A (Atomic, Molecular and Optical Physics),65(3):034709-1-034709-4.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 6 times in Scopus Article | Citations

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Title Pick-off annihilation in positronium scattering from alkali-metal ions
Author Ivanov, Igor A.
Mitroy, Jim
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Publication Date 2002
Volume Number 65
Issue Number 3
ISSN 1094-1622   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-0036508709
Start Page 034709-1
End Page 034709-4
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 When orthopositronium collides with a closed-shell atom or ion the “pick-off” process is the dominant process for positron annihilation. In pick-off annihilation the positron annihilates with electrons in the target but not with the electron that is part of the positronium atom. The rate for pick-off annihilation, expressed in terms of the dimensionless parameter 1Zeff, for orthopositronium scattering from Li+,Na+, and K+ was computed with an L2 variant of the fixed-core stochastic variational method. The threshold 1Zeff for Li+ and Na+, which can form a stable bound state with Ps were found to be 0.067 and 0.73, respectively, while that for K+, which does not bind Ps, was 0.064.
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Additional Notes Copyright by the The American Physical Society

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