L-subshell ionization of Au, Tl, Pb, Bi, Th, and U by protons

Journal Article · Tue Mar 01 04:00:00 EST 1977 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.15.943· OSTI ID:7230207

Barros Leite, C V; de Castro Faria, N V; de Pinho, A G

L-subshell ionization cross sections for Au, Tl, Pb, Bi, Th, and U by proton impact have been determined over the projectile range 0.5--3.5 MeV. The measured x-ray production cross sections of the total L shell and of some well resolved lines or groups of lines are consistent with those obtained by different authors in the same regions of bombarding energies and atomic numbers. Ionization cross sections were obtained by using the above results and experimental values for the relative radiative transition probabilities, fluorescence yields, and Coster-Kronig factors. The branching ratios of radiative transitions were measured and are in good agreement with the widely used theoretical calculations of Scofield, Rosner, and Bhalla. The values of fluorescence and Coster-Kronig yields were taken from previously published experiments performed in our laboratories. The influence of these experimental data on the shape of cross section versus proton energy curves is discussed. Comparisons of the experimentally determined L-subshell ionization cross sections are made with calculations in the plane-wave Born (PWBA), semiclassical, and binary-encounter approximations. The large effect of binding-energy, trajectory, and relativistic corrections on the PWBA calculations invalidates quantitative conclusions regarding agreement between experimental and theoretical values. Semiclassical arguments are presented, however, to explain some general aspects of the ionization cross-section curves.

• Research Organization: Department of Physics, Catholic University, Rio de Janeiro, Brazil
• OSTI ID: 7230207
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 15:3; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDES
BEAMS
BISMUTH
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
GOLD
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
IONIZATION
IONS
KEV RANGE
KEV RANGE 100-1000
L SHELL
LEAD
METALS
MEV RANGE
MEV RANGE 01-10
NUCLEON BEAMS
PARTICLE BEAMS
PROTON BEAMS
THALLIUM
THORIUM
TRANSITION ELEMENTS
URANIUM