Feshbach resonances in positron scattering from sodium |
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Authors: | L. Jiao Y. Zhou Y. Cheng R. M. Yu |
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Affiliation: | 1.Center for Theoretical Atomic and Molecular Physics, Academy of Fundamental and Interdisciplinary Sciences,Harbin Institute of Technology,Harbin,P.R. China |
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Abstract: | S-, P- and D-wave Feshbach resonances in positron-sodium scattering have been investigated by using the momentum space coupled-channels optical method. The target continuum and positronium (Ps) formation channels are included via an optical potential. Feshbach resonances below the target excitation and Ps (n = 2) formation thresholds are predicted and the effects of channel-coupling scheme, target continuum and Ps formation channels on the resonance energy and resonance width are discussed. We have also found the Wigner cusp structures at the inelastic channel-opening thresholds in positron-sodium scattering cross sections. |
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