Study of the Average Charge States of 188Pb and 252,254No Ions at the Gas-filled Separator TASCA

Research output: Contribution to journalArticle


The average charge states of Pb-188 and No-252,No-254 ions in dilute helium gas were measured at the gas-filled recoil separator TASCA. Hydrogen gas was also used as a filling gas for measurements of the average charge state of No-254. Helium and hydrogen gases at pressures from 0.2 mbar to 2.0 mbar were used. A strong dependence of the average charge state on the pressure of the filling gases was observed for both, helium and hydrogen. The influence of this dependence, classically attributed to the so-called "density effect", on the performance of TASCA was investigated. The average charge states of No-254 ions were also measured in mixtures of helium and hydrogen gases at low gas pressures around 1.0 mbar. From the experimental results simple expressions for the prediction of average charge states of heavy ions moving in rarefied helium gas, hydrogen gas, and in their mixture were derived. (C) 2012 Elsevier B.V. All rights reserved.


  • J. Khuyagbaatar
  • D. Ackermann
  • Lise-Lotte Andersson
  • J. Ballof
  • W. Bruechle
  • Ch. E. Duellmann
  • J. Dvorak
  • K. Eberhardt
  • J. Even
  • A. Gorshkov
  • R. Graeger
  • F. -P. Hessberger
  • D. Hild
  • Robert Hoischen
  • E. Jaeger
  • B. Kindler
  • J. V. Kratz
  • S. Lahiri
  • B. Lommel
  • M. Maiti
  • E. Merchan
  • M. Schaedel
  • H. Schaffner
  • B. Schausten
  • E. Schimpf
  • A. Semchenkov
  • A. Serov
  • A. Tuerler
  • A. Yakushev
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Accelerator Physics and Instrumentation


  • Gas-filled separator, Average charge state, Heavy ion, TASCA
Original languageEnglish
Pages (from-to)40-46
JournalNuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
Publication statusPublished - 2012
Publication categoryResearch

Total downloads

No data available