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Positron-atom scattering using pseudostate energy shifts

Mitroy, Jim, Zhang, Jun-Yi, Bromley, Michael W. J. and Young, S. I. (2008). Positron-atom scattering using pseudostate energy shifts. Physical Review A (Atomic, Molecular and Optical Physics),78(1):012715-1-012715-13.

Document type: Journal Article
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IRMA ID 80791673xPUB54
Title Positron-atom scattering using pseudostate energy shifts
Author Mitroy, Jim
Zhang, Jun-Yi
Bromley, Michael W. J.
Young, S. I.
Journal Name Physical Review A (Atomic, Molecular and Optical Physics)
Publication Date 2008
Volume Number 78
Issue Number 1
ISSN 1050-2947   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-48349102097
Start Page 012715-1
End Page 012715-13
Total Pages 13
Place of Publication College Park, United States
Publisher Amercian 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 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 4800a02, while Zeff achieves a value of 1310 at an energy of 0.109 eV.
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Additional Notes Copyright by the American Physical Society

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