Positron-helium collisions: Positronium formation using the distorted-wave approximation

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.062714· OSTI ID:21352358

Sen, Subhrangsu; Mandal, Puspajit ^[1]

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1. Department of Mathematics, Visva-Bharati University, Santiniketan, District Birbhum, 731 235 West Bengal (India)

Accurate Hylleraas-type correlated helium wave functions are used to predict positronium (Ps) formation cross sections in positron-helium collisions within the frame work of the distorted-wave approximation at intermediate and high energies of positron impact. Exponential correlated atomic target wave functions taking into account up to N=30 basis terms are utilized. Reliable total cross sections for the ground and excited 2s-state Ps formation are reported at intermediate and high energies. The present distorted-wave results are in conformity with the existing theoretical and experimental values available in the literature for intermediate and high-energy positrons. Surface plots of the DWA differential cross section reveal rich structures due to constructive and destructive interference between angular momentum states of the moving Ps.

• OSTI ID: 21352358
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 80; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
APPROXIMATIONS
ATOM COLLISIONS
ATOMS
CALCULATION METHODS
CHARGE EXCHANGE
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTORTED WAVE THEORY
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FERMIONS
FLUIDS
FUNCTIONS
GASES
GROUND STATES
HELIUM
LEPTONS
MATTER
NONMETALS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRONIUM
POSITRONS
RARE GASES
TOTAL CROSS SECTIONS
WAVE FUNCTIONS