Atomic collisions with relativistic heavy ions. IX. Ultrarelativistic collisions

Journal Article · Sun Nov 15 04:00:00 EST 1987 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.36.4628· OSTI ID:6061526

Anholt, R; Becker, U

The behavior of projectile electron capture and ionization cross sections at ultrarelativistic energies (>10 GeV/amu) is discussed. Three mechanisms contribute to electron capture at these energies: radiative and nonradiative capture and the capture of the electron following electron-positron pair production. The radiative and nonradiative cross sections both fall off as ..gamma../sup -1/ at high energies, (..gamma..-1)Mc/sup 2/ being the ion energy. The vacuum capture cross sections increase as the ln..gamma... Projectile 1s ionization cross sections also increase as ln..gamma.. at high energies if target screening is negligible. However, when the projectile atomic number is smaller than the target atomic number, the transverse interaction giving the ln..gamma.. term is screened and reduced. Therefore, the total 1s ionization cross sections are dominated by Coulomb ionization, and are nearly constant with increasing projectile energy. Tables of reduced capture and ionization cross sections are given, and are applied to calculating the charge states of ions in matter and the lifetime of ions in storage rings.

• Research Organization: Department of Physics, Stanford University, Stanford, California 94305-4060
• OSTI ID: 6061526
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 36:10; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ATOM COLLISIONS
CAPTURE
CHARGE STATES
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON CAPTURE
ELECTRON LOSS
ELEMENTARY PARTICLES
EMISSION
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 10-100
INTERACTIONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
LEPTONS
MULTICHARGED IONS
PAIR PRODUCTION
POSITRONS
RELATIVISTIC RANGE
SECONDARY EMISSION
STORAGE RINGS