Hyperspherical coupled-channel calculations of positronium formation in low-energy positron-helium collisions

Journal Article · Sun Dec 01 00:00:00 EST 1996 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.54.5004· OSTI ID:397549

Igarashi, A ^[1]; Toshima, N ^[2]; Shirai, T ^[1]

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1. Department of Reactor Engineering, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11 (Japan)
2. Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan)

The hyperspherical coupled-channel method is applied to the positron-helium scatterings in a low-energy region below 54.4 eV. An independent electron model is used for the helium atom under the approximation that the active electron is bound by a central model potential. All the hyperspherical adiabatic states associated with Ps({ital n},l; {ital n}=1-4, l=0-2) and He(1{ital sn}l; {ital n}=1-5, l=0-3) in the separated-atom limit are coupled for the expansion of the scattering equation, which is solved by means of a hybrid procedure of the diabatic-by-sector and the conventional adiabatic-basis-expansion methods. Excellent agreement is obtained with experiment for the positronium formation. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 397549
• Journal Information: Physical Review A, Vol. 54, Issue 6; Other Information: PBD: Dec 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM
POSITRON-ATOM COLLISIONS
POSITRONS
POSITRONIUM
SYNTHESIS
EV RANGE 10-100
COUPLED CHANNEL BORN APPROXIMATION
EXPANSION