Phys. Rev. A 69, 052702 (2004) [15 pages]Positron scattering and annihilation from hydrogenlike ionsReceived 10 December 2003; published 4 May 2004 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 Zeff for positron-hydrogenic ion scattering. The phase shifts are within 1–2% of the best previous calculations. The values of Zeff are small and do not exceed unity for any of the momenta considered. At thermal energies Zeff is minute with a value of order 10−50 occurring for He+ at k=0.05a0−1. 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.69.052702
DOI:
10.1103/PhysRevA.69.052702
PACS:
34.85.+x, 34.10.+x, 78.70.Bj
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.