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Positron scattering and annihilation from hydrogenlike ions

Mitroy, Jim, Novikov, Sergey A. and Bromley, Michael W. J. (2004). Positron scattering and annihilation from hydrogenlike ions. Physical Review A (Atomic, Molecular and Optical Physics),69(5B):052702-1-052702-15.

Document type: Journal Article
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Title Positron scattering and annihilation from hydrogenlike ions
Author Mitroy, Jim
Novikov, Sergey A.
Bromley, Michael W. J.
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Publication Date 2004
Volume Number 69
Issue Number 5B
ISSN 1094-1622   (check CDU catalogue open catalogue search in new window)
Start Page 052702-1
End Page 052702-15
Total Pages 15
Place of Publication College Park, United States
Publisher The 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 Kohn variational method is used with a configuration-interaction-type wave function to determine the J=0 and J=1 phase shifts and annihilation parameter Z(eff) for positron-hydrogenic ion scattering. The phase shifts are within 1-2% of the best previous calculations. The values of Z(eff) are small and do not exceed unity for any of the momenta considered. At thermal energies Z(eff) is minute with a value of order 10(-50) occurring for He+ at k=0.05a(0)(-1). In addition to the variational calculations, analytic expressions for the phase shift and annihilation parameters within the Coulomb wave Born approximation are derived and used to help elucidate the dynamics of positron collisions with positive ions.
Keywords atoms
collisions
expansions
electron
state
DOI http://dx.doi.org/10.1103/PhysRevA.69.052702   (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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