Positron-atom scattering using pseudostate energy shifts

Mitroy, J., Zhang, J. Y., Bromley, M. W. J. and Young, S. I. (2008) Positron-atom scattering using pseudostate energy shifts. Physical Review a, 78 1: . doi:10.1103/PhysRevA.78.012715

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Author Mitroy, J.
Zhang, J. Y.
Bromley, M. W. J.
Young, S. I.
Title Positron-atom scattering using pseudostate energy shifts
Journal name Physical Review a   Check publisher's open access policy
ISSN 1050-2947
Publication date 2008-07-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.78.012715
Open Access Status File (Publisher version)
Volume 78
Issue 1
Total pages 13
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Formatted abstract
A method to generate low-energy phase shifts for elastic scattering using bound-state calculations is applied to the problem of e+ -Mg and e+ -Zn scattering after an initial validation on the e+ -Cu system. The energy shift between a small reference calculation and the largest possible configuration interaction calculation of the lowest-energy pseudostate is used to tune a semiempirical optical potential. The potential was further fine-tuned by utilizing the energy of the second lowest pseudostate. The s - and p -wave phase shifts for positron scattering from Mg and Zn are given from threshold to the first excitation threshold. The e+ -Mg cross section has a prominent p -wave shape resonance at an energy of about 0.096 eV with a width of 0.106 eV. The peak cross section for e+ -Mg scattering is about 4800 a02, while Zeff achieves a value of 1310 at an energy of 0.109 eV. © 2008 The American Physical Society.
Keyword Polarized Orbital Approximation
Hydrogen Elastic-Scattering
Many-Body Scattering
Variational Calculations
Zinc Atoms
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article #012715

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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