Proton angular distributions and highly differential cross sections for ionization of helium by proton impact

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.44.1565· OSTI ID:5267946

Fukuda, H; Shimamura, I; Vegh, L; Watanabe, T ^[1]

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1. RIKEN (Institute of Physical and Chemical Research), Wako, Saitama 351-01, Japan (JP)

The eikonal distorted-wave method is applied to single ionization in proton-helium collisions at laboratory energies of 300 keV, 500 keV, 1 MeV, and 3 MeV. The angular distributions of scattered protons agree well with recent experimental results, showing substantial improvement over the plane-wave Born approximation especially at large scattering angles {Theta}. The momentum distributions of the ejected electrons at fixed values of {Theta} are calculated. In particular, those of the electrons ejected mainly in binary proton-electron collisions are studied in detail. The momentum distributions of the recoil He{sup +} ions at fixed values of {Theta} are also discussed by comparing with the results of recent coincidence measurements. At such small {Theta} at which the plane-wave Born and the eikonal distorted-wave approximations give nearly the same cross sections and are expected to be accurate, these approximations lead to average momenta of recoil ions significantly lower than the measured values.

• OSTI ID: 5267946
• Journal Information: Physical Review A. General Physics; (United States), Vol. 44:3; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HELIUM
ION-ATOM COLLISIONS
DIFFERENTIAL CROSS SECTIONS
PROTONS
ANGULAR DISTRIBUTION
DISTORTED WAVE THEORY
IONIZATION
KEV RANGE 100-1000
ATOM COLLISIONS
BARYONS
COLLISIONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FLUIDS
GASES
HADRONS
ION COLLISIONS
KEV RANGE
NONMETALS
NUCLEONS
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena