Abstract
We present an investigation of Feshbach resonances in positron-sodium scattering system. The momentum space coupled channels optical method including the positronium formation channels has been used. The first three partial-wave resonances below the Na(3p,4s,3d,4p) excitation and the Ps(n=2) formation thresholds are calculated. The Wigner cusp structures are also obtained just at these thresholds.
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