Electron loss from fast heavy ions: Target-scaling dependence

Journal Article · Mon Aug 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.022702· OSTI ID:22075470

DuBois, R D ^[1]; Santos, A C. F.; Montenegro, E C ^[2]; Sigaud, G M ^[3]

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1. Department of Physics, Missouri University of Science and Technology, Rolla, Missouri 65409 (United States)
2. Instituto de Fisica, UFRJ, Caixa Postal 68528 Rio de Janeiro, BR-21941-972 RJ (Brazil)
3. Departamento de Fisica, Pontificia Universidade Catolica do Rio de Janeiro, Caixa Postal 38071, Rio de Janeiro, BR-22452-970 RJ (Brazil)

The target dependence for projectile electron loss is investigated using experimental data taken from the literature. Impact energies range from a few tens of eV/u to tens of MeV/u. For energies less than several MeV/u, the target dependences are shown to be very similar, independent of projectile species and charge state. Overall, however, with increasing impact energy the cross-section dependence on the target nuclear charge systematically increases. It is shown that none of the existing cross-section target scaling models reproduce these features. A model, based on Born scaling and including both the antiscreening and screening contributions to projectile electron loss, is developed. With the inclusion of relativistic effects, which increase the contribution from both channels at high energies, and ''target saturation'' effects, which reduce the contribution from the screening term for heavy targets and lower impact energies, this model describes quite reasonably all available experimental data. A simple scaling formula that reproduces the measured atomic number and impact velocity dependences is provided. This formula is applicable for projectile electron loss in collisions with either atomic or molecular targets and for impact energies ranging from a few to tens of MeV/u.

• OSTI ID: 22075470
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC NUMBER
CHARGE STATES
COLLISIONS
CROSS SECTIONS
ELECTRON LOSS
HEAVY IONS
RELATIVISTIC RANGE