Atomic collisions with relativistic heavy ions. VIII. Charge-state studies of relativistic uranium ions

Journal Article · Sat Aug 15 04:00:00 EDT 1987 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.36.1586· OSTI ID:6056829

Anholt, R; Meyerhof, W E; Xu, X; Gould, H; Feinberg, B; McDonald, R J; Wegner, H E; Thieberger, P

Charge-state distributions were measured for incident 105-, 220-, 430-, and 955-MeV/amu U ions on thin and thick solid targets. Initial bare, one-, two-, three-, nine-, and 24-electron ions were used, so that single and multiple ionization of K-, L-, and M-shell electrons and electron capture into bare ions and into ions having initially full or partially full K and L shells could be observed. Multiple-ionization effects in two-electron U ions and in ions having many electrons in the K, L, and M shells are calculated by using the semiclassical approximation and assuming binomial statistics. Binding effects on K-shell ionization are compared with previous measurements using relativistic Xe ions, and with the Glauber theory. For 430- and 955-MeV/amu U ions, good agreement is obtained between measured capture cross sections and calculated radiative and nonradiative (eikonal-approximation) cross sections. Some disagreement is found at lower energies. An approximate model is proposed for multiple-capture cross sections. Finally, the measured equilibrium charge states are compared to ground-state models and to models including excited-state effects. Excited-state effects are less important for relativistic U ions than for any other ion in matter. Differences between the excited- and ground-state models are found to be too small to be observed.

• Research Organization: Department of Physics, Stanford University, Stanford, California 94305
• OSTI ID: 6056829
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 36:4; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CAPTURE
CHARGE STATES
CHARGED PARTICLES
COLLISIONS
ELECTRON CAPTURE
ENERGY RANGE
EQUILIBRIUM
GEV RANGE
GEV RANGE 100-1000
GLAUBER THEORY
INNER-SHELL IONIZATION
ION COLLISIONS
IONIZATION
IONS
MULTICHARGED IONS
URANIUM IONS
XENON IONS