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• W2320731992 abstract "A central field model is used to study the two-photon positron annihilation spectrum for the rare gas atoms He, Ne, Ar, Kr, and Xe at energies close to thermal. Correlation effects are incorporated with a semiempirical polarization potential. The $ensuremath{gamma}$ spectrum is given, with values reported for individual subshells. The predicted full widths at half-maximum (FWHM) for all systems are typically $5%--20%$ larger than the experimental values reported using the positron trap at the University of California, San Diego, while, with the exception of neon, generally being $2%--10%$ smaller than the FWHMs measured at University College London. The detailed spectrum for xenon is reported and the likelihood of core annihilation's making a measurable contribution to the observed Doppler spectrum is discussed. The $ensuremath{gamma}$ spectra are found to be insensitive to variations in the scattering potential and whether the target is represented by a Hartree-Fock or a Dirac-Fock wave function. The model potential used in the solution of the positron-atom Schrodinger equation provides a reasonable fit to recent total elastic cross-section measurements reported by the Australian National University and University of Trento groups." @default.
• W2320731992 created "2016-06-24" @default.
• W2320731992 creator A5020074265 @default.
• W2320731992 creator A5029212290 @default.
• W2320731992 date "2014-10-06" @default.
• W2320731992 modified "2023-10-17" @default.
• W2320731992 title "Central-field model for the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>γ</mml:mi></mml:math> spectrum of positrons annihilating on rare-gas atoms" @default.
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• W2320731992 doi "https://doi.org/10.1103/physreva.90.042702" @default.
• W2320731992 hasPublicationYear "2014" @default.
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