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Systematic study of charge-state and energy dependences of transfer-ionization to single-electron-capture ratios for Fq+ ions incident on He

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Tawara,  H.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Citation

Ünal, R., Richard, P., Ben-Itzhak, I., Cocke, C. L., Singh, M. J., Tawara, H., et al. (2007). Systematic study of charge-state and energy dependences of transfer-ionization to single-electron-capture ratios for Fq+ ions incident on He. Physical Review A, 76(1): 012710, pp. 1-7. doi:10.1103/PhysRevA.76.012710.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7CB3-7
Abstract
his paper presents an investigation of the charge-state and energy dependences of transfer-ionization (TI) and single-electron-capture (SC) processes for fluorine ions (q=4+ to 9+) incident on a supersonic He jet target. The measurements were made for beam energies between 0.5 and 2.5 MeV/u. A recoil ion momentum spectrometer was used to separate TI and SC based on the longitudinal momentum transfer and time of flight of the recoil ions. The cross-section ratios for TI to SC, R=sigmaTI/sigmaSC, were determined and observed to decrease monotonically with velocity. The values of R were combined with measured total transfer cross sections to deduce the cross sections for both SC and TI. Coupled-channel calculations of the energy dependence of TI and SC for F9++He were compared to the experimental cross sections as well as the values of R. The calculated cross sections were found to be slightly lower and the R values slightly higher than the measured values, but with approximately the same energy dependences. A q2 scaling of the He2++He data was also compared to the present data and was found to give unexpected good agreement.