Electron capture and ionization of 33-TeV Pb ions in gas targets

We have measured the total cross sections for electron capture by bare Pb{sup 82+} ions and for the ionization of hydrogenlike Pb{sup 81+}(1s) ions at 158GeV/A, {gamma}=168, in Ar, Kr, and Xe gas targets. At this energy, the total capture cross sections are dominated by electron capture from pair pr...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2001, Vol.63 (3), Article 032711
Main Authors: Krause, H. F., Vane, C. R., Datz, S., Grafström, P., Knudsen, H., Mikkelsen, U., Scheidenberger, C., Schuch, R. H., Vilakazi, Z.
Format: Article
Language:English
Subjects:
CROSS SECTIONS
ELECTRON CAPTURE
IONIZATION
NUCLEAR PHYSICS AND RADIATION PHYSICS
PAIR PRODUCTION
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
SATURATION
TARGETS
TOTAL CROSS SECTIONS
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Summary:We have measured the total cross sections for electron capture by bare Pb{sup 82+} ions and for the ionization of hydrogenlike Pb{sup 81+}(1s) ions at 158GeV/A, {gamma}=168, in Ar, Kr, and Xe gas targets. At this energy, the total capture cross sections are dominated by electron capture from pair production. The capture measurements are compared with the results of several theoretical calculations and with similar measurements made with solid targets. The Pb{sup 81+}(1s) ionization cross sections obtained, which are substantially lower than those measured in solids, agree well with recent calculations that predict saturation at high energies from target screening effects.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.63.032711