S-, P- and D-wave resonances in positronium-sodium and positronium-potassium scattering
Abstract
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.
Keywords
Cite
@article{arxiv.physics/0103035,
title = {S-, P- and D-wave resonances in positronium-sodium and positronium-potassium scattering},
author = {Sadhan K. Adhikari and Puspajit Mandal},
journal= {arXiv preprint arXiv:physics/0103035},
year = {2009}
}
Comments
9 pages, 5 figures, Accepted in Journal of Physics B