Large scale calculations of positron-hydrogen system at low energies

Journal Article · Wed May 01 04:00:00 EDT 1996 · Bulletin of the American Physical Society

OSTI ID:394343

Kuang, Yu Rang; Gien, T T ^[1]

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1. Memorial Univ. of Newfoundland, St. John`s (Canada)

Two large scale, 18-state and 20-state, close coupling calculations of positron-hydrogen scattering have been carried out by using the Harris-Nesbet algebraic method at energies below the first hydrogen excitation threshold. Both sets of phase shifts, elastic and Ps formation cross sections for positron-H(1s) entrance channel and Ps elastic and H formation cross sections for Ps-p entrance channel are in good agreement with each other and with the existing accurate data, except for the S-wave phase shifts and S- and P-wave elastic cross sections in the Ore gap where the 20-state basis gives better results than the 18-state basis. A possible reason for such a difference is that the 18-state scheme may not describe the short range interaction well. This work confirms that the 20-or 21-state coupling scheme may be preferably chosen for low energy positron-hydrogen scattering.

• OSTI ID: 394343
• Report Number(s): CONF-9605105--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALCULATION METHODS
ELASTIC SCATTERING
EV RANGE 01-10
EV RANGE 10-100
HYDROGEN
MILLI EV RANGE
PARTICLE PRODUCTION
PHASE SHIFT
POSITRON-ATOM COLLISIONS
POSITRONIUM