Annihilation in positron-helium scattering
- 1 June 1974
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 7 (9), L286-L289
- https://doi.org/10.1088/0022-3700/7/9/004
Abstract
The positron-helium wavefunctions obtained previously (Humberston 1973) are used to calculate the annihilation rate parameter Zefff at several positron momenta. A mistake in the previously quoted value of Zeff at zero energy for the helium model H5 is corrected, and the new result agrees well with a recent measurement. The angular distribution of the annihilation gamma rays is also calculated, but the agreement with experiment is not as good for the model H5 as it is for the cruder model DB. An explanation of this phenomenon is suggested.Keywords
This publication has 12 references indexed in Scilit:
- Total cross sections for the scattering of positrons by heliumJournal of Physics B: Atomic and Molecular Physics, 1974
- The scattering of low energy positrons by heliumJournal of Physics B: Atomic and Molecular Physics, 1973
- The measurement of total cross sections for positrons of energies 2-400 eV in He, Ne, Ar, and KrJournal of Physics B: Atomic and Molecular Physics, 1973
- Positron–Helium Scattering Cross Sections and Phase Shifts below 19 eVCanadian Journal of Physics, 1973
- The elastic scattering of positrons by atomic hydrogenJournal of Physics B: Atomic and Molecular Physics, 1972
- Positron-Atom Scattering by the Kohn and Harris MethodsPhysical Review A, 1971
- Addendum to "Variational Bounds in Positron-Atom Scattering"Physical Review B, 1969
- Variational Bounds in Positron-Atom ScatteringPhysical Review B, 1968
- Zero-Point Bubbles in LiquidsPhysical Review Letters, 1968
- Theory of Low-Energy Positron-Helium ScatteringPhysical Review B, 1966