Average charge states of heavy and superheavy ions passing through a rarified gas: Theory and experimentKhuyagbaatar, 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.
Research output: Contribution to journal › Article › Academic › peer-review
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.
|Number of pages||8|
|Journal||Physical Review A|
|Publication status||Published - 8-Oct-2013|
- CHANGING CROSS-SECTIONS, CA-48-INDUCED REACTIONS, IONIZATION-POTENTIALS, ELECTRONIC-STRUCTURE, HEAVIEST ELEMENTS, EXCITED-LEVELS, SEPARATOR, EXCITATION, DISCOVERY, ENERGIES