Abstract
Experimental data on the charge-evolution functions F q ( D), including equilibrium fractions F ∞ q , are presented when 4.3 MeV/u C 2+ and 6.0 MeV/u Mg 5+, Ca 6+ and Kr 13+ ions from the NIRS-HIMAC injector linac passed through carbon foils with the thickness over D=10–350 μg/cm 2 range. The revised experimental F ∞ q values for 6.0 MeV/u C 2+, Ne 4+, Si 5+, Ar 8+, Fe 9+ and Cu 10+ ions previously reported are also given. The charge equilibrium thicknesses D E for bare and H-like ions are evaluated for projectiles lighter than Ca. The F q ( D), F ∞ q and D E data are compared with the results calculated by the ETACHA code and the statistical model. It was found that the ETACHA code can reproduce quite well the observed F q ( D), F ∞ q and D E data for projectiles lighter than Si (atomic number Z=14) but the discrepancy becomes serious for heavier ions. The prediction of the statistical model for the equilibrium charge-state fractions F ∞ q agrees well with the observed experimental data for ions with Z>18, i.e. heavier than argon.
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