Authors Referees APS Members |
December 2007, to be published in Physical Review A
$S$-wave resonances in positron-sodium scattering
We have calculated $S$-wave resonances in the positron-sodium system using the stabilization method in the framework of hyperspherical coordinates. Resonances below the Ps($n=2$) threshold have been investigated. We have located all the previously known $S$-wave resonances by Kar and Ho [Euro. Phys. J. D. {\bf 35}, 453 (2005)] and Ward \emph{et al} [J. Phys. B {\bf 22} 3763 (1989)] and observed relatively good agreement for the resonance positions. In addition, two new higher-lying resonances associated with the Ps($n=2$) threshold are found to be at energies of $-0.06656$ a.u. and $-0.06353$ a.u. © 2008 The American Physical Society.
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