Positron-atom scattering using pseudo-state energy shifts

Details Positron-atom scattering using pseudo-state energy shifts Positron-atom scattering using pseudo-state energy shifts

2008-02-11

arxiv.org/abs/0802.1371v2

Physics

Atomic Physics

15 pages, 15 figures, submitted to PRA (updated following referee comments)

Scientific paper

10.1103/PhysRevA.78.012715

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 pseudo-state is used to tune a semi-empirical optical potential. The potential was further fine-tuned by utilizing the energy of the second lowest pseudo-state. 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 a_0^2 while Z_eff achieves a value of 1310 at an energy of 0.109 eV.

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