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Average charge states of heavy and superheavy ions passing through a rarified gas: Theory and experiment

Khuyagbaatar, J., Shevelko, V. P., Borschevsky, A., Duellmann, C. E., Tolstikhina, I. Y. & Yakushev, A., 8-Oct-2013, In : Physical Review A. 88, 4, 8 p., 042703.

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DOI

  • J. Khuyagbaatar
  • V. P. Shevelko
  • A. Borschevsky
  • Ch. E. Duellmann
  • I. Yu. Tolstikhina
  • A. Yakushev

The average charge states (q) over bar of heavy and superheavy ions (atomic numbers Z = 80-114) passing through He gas are studied experimentally and theoretically. Experimental data were measured at the gas-filled recoil separator, i.e., the TransActinide Separator and Chemistry Apparatus (TASCA) at GSI Darmstadt, for ion energies of a few hundred keV/u at gas pressures of 0.2 to 2.0 mbar. An attempt is made to describe experimental (q) over bar values by means of atomic calculations of the binding energies and electron-loss and electron-capture cross sections. The influence of the gas-density effect is included in the calculations. The calculated (q) over bar reproduce the experimental values for elements with Z = 80-114 within 20%. A comparison with different semiempirical models is presented as well, including a local fit of high accuracy, which is often used in superheavy-element experiments to estimate the average charge states of heavy ions, e.g., at the gas-filled recoil separator TASCA. The (q) over bar values for elements with Z = 115, 117, 119, and 120 at He-gas pressure of 0.8 mbar are predicted.

Original languageEnglish
Article number042703
Number of pages8
JournalPhysical Review A
Volume88
Issue number4
Publication statusPublished - 8-Oct-2013
Externally publishedYes

    Keywords

  • CHANGING CROSS-SECTIONS, CA-48-INDUCED REACTIONS, IONIZATION-POTENTIALS, ELECTRONIC-STRUCTURE, HEAVIEST ELEMENTS, EXCITED-LEVELS, SEPARATOR, EXCITATION, DISCOVERY, ENERGIES

ID: 31140061