S-, P- and D-wave resonances in positronium-sodium and positronium-potassium scattering

Details S-, P- and D-wave resonances in positronium-sodium and positronium-potassium scattering S-, P- and D-wave resonances in positronium-sodium and positronium-potassium scattering

2001-03-13

arxiv.org/abs/physics/0103035v3

J. Phys. B 34 (2001) 1361-1367

Physics

Atomic Physics

9 pages, 5 figures, Accepted in Journal of Physics B

Scientific paper

10.1088/0953-4075/34/8/302

Scattering of positronium (Ps) by sodium and potassium 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 fitted to reproduce accurate theoretical results for PsNa and PsK binding energies. We find a narrow S-wave singlet resonance at 4.58 eV of width 0.002 eV in the Ps-Na system and at 4.77 eV of width 0.003 eV in the Ps-K system. Singlet P-wave resonances in both systems are found at 5.07 eV of width 0.3 eV. Singlet D-wave structures are found at 5.3 eV in both systems. We also report results for elastic and Ps-excitation cross sections for Ps scattering by Na and K.

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