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Strong continuum-continuum couplings in the direct ionization of Ar and He atoms by 6-MeV/u U sup 38+ and Th sup 38+ projectiles

Journal Article · · Physical Review (Section) A: General Physics; (USA)
;  [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (US)
  2. Lawrence Berkeley Laboratory, Berkeley, California 94720
  3. University of Missouri, Rolla, Missouri 65401
  4. Queens University, Belfast, Northern Ireland
  5. North Carolina State University, Raleigh, North Carolina 27695
  6. Battelle Institute, Pacific Northwest Laboratory, Richland, Washington 99538
  7. Angelo State University, San Angelo, Texas 76909
+ Show Author Affiliations
Doubly differential cross sections have been measured as a function of the electron energy and observation angle for electron emission following collisions of 6-MeV/u U{sup 38+} and Th{sup 38+} on He and Ar. The electron-emission data show an enhancement at forward angles and a decrease at backward angles with respect to scaled-cross-section results based on the Born approximation. Comparison with classical-trajectory Monte Carlo calculations suggests that the deviation from the Born approximation can be explained by continuum-continuum couplings. By comparing with previously published data, we found that the forward enhancement as well as the backward decrease follow a {ital q}/{ital v}{sub {ital p}} ({ital q},{ital v}{sub {ital p}} are the projectile charge and velocity) scaling.
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
5593732
Journal Information:
Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:6; ISSN PLRAA; ISSN 0556-2791
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
ARGON
ATOM COLLISIONS
AUGMENTATION
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
HELIUM
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MEV RANGE
MEV RANGE 100-1000
MULTICHARGED IONS
NONMETALS
RARE GASES
SCATTERING
SMALL ANGLE SCATTERING
THORIUM IONS
URANIUM IONS