Artículos de revistas
S-, P- and D-wave resonances in positronium-sodium and positronium-potassium scattering
Fecha
2001-04-28Registro en:
Journal of Physics B-atomic Molecular and Optical Physics. Bristol: Iop Publishing Ltd, v. 34, n. 8, p. 1361-1367, 2001.
0953-4075
10.1088/0953-4075/34/8/302
WOS:000168612400007
8031087349809439
Autor
Universidade Estadual Paulista (Unesp)
Dept Math
Institución
Resumen
Scattering of positronium (Ps) by sodium and potassium atoms has been investigated employing a three-Ps-state coupled-channel model with Ps(ls,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.