Measurements of total scattering cross sections for intermediate-energy positrons and electrons colliding with helium, neon, and argon
Total scattering cross sections have been measured in the same apparatus for positrons and electrons colliding with helium, neon, and argon atoms in the energy range from 15 to 800 eV using a beam-transmission technique. These measurements reveal a merging of the positron and electron cross-section curves for helium at energies above 200 eV while the available theories predict this merging to occur at considerably higher energies. For neon and argon the positron and electron total-cross-section curves are slowly approaching each other at the highest energies. The present experimental approach is analyzed with regard to the discrimination against small-angle forward elastic scattering, and estimates are made of other potential errors in the measured total cross sections. The present results are used to test the zero-energy sum rule, obtained from forward dispersion relations, and it is found that these data are consistent with prior measurements in that the sum rule is found to fail for electron scattering and to be valid for positron scattering.
- Research Organization:
- Department of Physics, Wayne State University, Detroit, Michigan 48202
- OSTI ID:
- 6456493
- Journal Information:
- Phys. Rev. A; (United States), Vol. 24:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARGON
ELECTRON-ATOM COLLISIONS
POSITRON-ATOM COLLISIONS
TOTAL CROSS SECTIONS
HELIUM
NEON
ENERGY DEPENDENCE
EV RANGE 10-100
EV RANGE 100-1000
EXPERIMENTAL DATA
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
DATA
ELECTRON COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
FLUIDS
GASES
INFORMATION
NONMETALS
NUMERICAL DATA
POSITRON COLLISIONS
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena