Abstract
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 [Eur. Phys. J. D 35, 453 (2005)] and Ward [J. Phys. B 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 -0.066 56 and -0.063 53 a.u.
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