Continuum-distorted-wave calculations for rearrangement cross sections and their sensitivity to improvements in the target wave function: Proton-helium collisions. [25 KeV to 3 MeV]
Journal Article
·
· Phys. Rev., A; (United States)
The continuum-distorted-wave (CDW) approximation has been used to calculate the electron-capture cross sections Q(nl) when a fast proton collides with a helium target atom. The range of the projectile energy is from 25 keV to 3 MeV and the electron-capture states considered are nl = 1s, 2s, and 2p. Of specific interest here is the sensitivity of these cross sections with respect to a systematic improvement in the description of the target ground-state wave function, both up to and beyond the Hartree-Fock level. Large changes are found to occur in the magnitude of each Q(nl) as we progress from a simple one-parameter wave function for He up to a configuration-interaction description: The latter wave function accounted for about 99% of the electron correlation energy. Values of the total capture cross section were determined and compared with experiment over the available energy range of 100--2990 keV. The correlated results were, overall, in good agreement with experiment--especially in the high-energy region.
- Research Organization:
- Department of Physics, University of Leicester, Leicester, England
- OSTI ID:
- 7304583
- Journal Information:
- Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 16:1; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMIC IONS
BEAMS
CAPTURE
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CONFIGURATION INTERACTION
CROSS SECTIONS
CRYOGENIC FLUIDS
DISTORTED WAVE THEORY
ELECTRON CAPTURE
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EXCHANGE INTERACTIONS
FLUIDS
FUNCTIONS
GROUND STATES
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INTERACTIONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
MEV RANGE
MEV RANGE 01-10
NONMETALS
NUCLEON BEAMS
PARTICLE BEAMS
PROTON BEAMS
RARE GASES
TARGETS
WAVE FUNCTIONS
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMIC IONS
BEAMS
CAPTURE
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CONFIGURATION INTERACTION
CROSS SECTIONS
CRYOGENIC FLUIDS
DISTORTED WAVE THEORY
ELECTRON CAPTURE
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EXCHANGE INTERACTIONS
FLUIDS
FUNCTIONS
GROUND STATES
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INTERACTIONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
MEV RANGE
MEV RANGE 01-10
NONMETALS
NUCLEON BEAMS
PARTICLE BEAMS
PROTON BEAMS
RARE GASES
TARGETS
WAVE FUNCTIONS