Direct reactions in relativistic atomic collisions and the influence of Coulomb boundary conditions

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.42.3896· OSTI ID:6060685

Toshima, N ^[1]; Eichler, J ^[2]

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1. Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan)
2. Bereich Schwerionenphysik, Hahn-Meitner-Institut Berlin, D-1000 Berlin 39 (Federal Republic of Germany)

It is shown that in a Born treatment of excitation, ionization, and pair production in relativistic atomic collisions, cross-section calculations are not affected by the presence or absence of explicitly imposed Coulomb boundary conditions. On the other hand, in relativistic single- or two-center coupled-channel calculations, the results are strongly affected. For U{sup 92+}+U{sup 91+} collisions at 1 GeV/u, it is illustrated that in all calculations unperturbed atomic basis sets lead to long-range couplings along the trajectory while for basis states satisfying boundary conditions the couplings among states are localized around the distance of closest approach. The necessity of imposing Coulomb boundary conditions for relativistic direct reactions is emphasized.

• OSTI ID: 6060685
• Journal Information: Physical Review, A; (USA), Journal Name: Physical Review, A; (USA) Vol. 42:7; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BOUNDARY CONDITIONS
CHARGED PARTICLES
COLLISIONS
COULOMB FIELD
COUPLED CHANNEL THEORY
CROSS SECTIONS
ELECTRIC FIELDS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
GEV RANGE
GEV RANGE 100-1000
ION COLLISIONS
ION-ION COLLISIONS
IONIZATION
IONS
MULTICHARGED IONS
RELATIVISTIC RANGE
URANIUM IONS