Penetration of 4.3 and 6.0 MeV/u highly charged, heavy ions through carbon foils

✍ Scribed by Y. Sato; T. Miyoshi; T. Murakami; K. Noda; V.P. Shevelko; H. Tawara

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 610 KB
• Volume: 225
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2004.05.028

✦ Synopsis

Experimental data on the charge-evolution functions F q ðDÞ, including equilibrium fractions F 1 q , are presented when 4.3 MeV/u C 2þ and 6.0 MeV/u Mg 5þ , Ca 6þ and Kr 13þ ions from the NIRS-HIMAC injector linac passed through carbon foils with the thickness over D ¼ 10-350 lg/cm 2 range. The revised experimental F 1 q values for 6.0 MeV/u C 2þ , Ne 4þ , Si 5þ , Ar 8þ , Fe 9þ and Cu 10þ 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 ðDÞ; F 1 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 ðDÞ, F 1 q and D E data for projectiles lighter than Si (atomic number Z ¼ 14) but the discrepancy becomes serious for heavier ions. The prediction of the statistical model for the equilibrium charge-state fractions F 1 q agrees well with the observed experimental data for ions with Z > 18, i.e. heavier than argon.