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Resonances in positronium-rubidium and positronium-cesium scattering | | Sadhan K. Adhikari
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10 Apr 2001 | | Journal: | Phys. Lett. A 283 (2001) 224-228 | | Subject: | Chemical Physics; Atomic and Molecular Clusters; Atomic Physics | physics.chem-ph physics.atm-clus physics.atom-ph | | Abstract: | Scattering of ortho positronium (Ps) by cesium and rubidium atoms has been investigated employing a three-Ps-state coupled-channel model with Ps(1s,2s,2p) states using a time-reversal-symmetric regularized electron-exchange model potential. We find a narrow S-wave singlet resonance at 5.057 eV of width 0.003 eV in the Ps-Rb system and at 5.067 eV of width 0.003 eV in the Ps-Cs system. Singlet P-wave resonances in both systems are found at 5.3 eV of width 0.4 eV. Singlet D-wave structures are found at 5.4 eV in both systems. The pronounced P- and D-wave resonances in these systems lead to easily detectable local minima in the low-energy elastic cross sections. We also report results for elastic and Ps-excitation cross sections for Ps scattering by Rb and Cs. | | Source: | arXiv, physics/0104037 | | Services: | Forum | Review | PDF | Favorites | |
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