Abstract
Beam lifetimes of stored U28+ ions with kinetic energies of 30 and 50 MeV/u, respectively, were measured in the experimental storage ring of the GSI accelerator facility. By using the internal gas target station of the experimental storage ring, it was possible to obtain total projectile electron loss cross sections for collisions with several gaseous targets ranging from hydrogen to krypton from the beam lifetime data. The resulting experimental cross sections are compared to predictions by two theoretical approaches, namely the CTMC method and a combination of the DEPOSIT code and the RICODE program.
Figures
![FIG. 2. Verification of the assumed spatial profile of the target jet: The new and the previous target models were convoluted numerically with a Gaussian shaped ion beam in order to reproduce experimental data for the effective overlap between target and ion beam [47]. The latter is given by the projectile charge exchange rate that was measured as a function of the horizontal position of the ion beam axis. The new model yields good agreement with experiment. See text for details.](https://s3-eu-west-1.amazonaws.com/com.mendeley.prod.article-extracted-content/images/3e4c4f15-660c-3ae3-a442-9abc391d144c/thumbnail-44bce552-0c48-4208-9d2a-0e3ad43e6e7d-1.png)
![FIG. 3. Experimental total electron loss cross sections of U28þ ions in comparison to calculations performed by Shevelko et al. (DEPOSIT þ RICODE) [53] and by Olson et al. (CTMC) [29]. Values for H and N were obtained by dividing the measurements for the molecular targets by a factor of 2. While both theories are in qualitative agreement with the experimental data for H, the CTMC results significantly overestimate the cross section for N and Ar. In contrast, DEPOSITþ RICODE predictions are in good agreement with experimental results for all targets but for the heaviest one, namely Kr.](https://s3-eu-west-1.amazonaws.com/com.mendeley.prod.article-extracted-content/images/3e4c4f15-660c-3ae3-a442-9abc391d144c/thumbnail-beee1294-2ec6-4721-a5d7-598d7653ab12-2.png)
![TABLE I. Experimental cross sections for total electron loss of U28þ ions in collisions with gaseous targets. Previous data are taken from Franzke [21], Erb [20], Olson et al. [29], Perumal et al. [30], and Weber et al. [32]. In case of the Franzke data the values result from an interpolation between measurements for U20þ and U30þ ions, while the Erb value was obtained by a similar interpolation between data points for U27þ and U30þ. Uncertainties are given if available.](https://s3-eu-west-1.amazonaws.com/com.mendeley.prod.article-extracted-content/images/3e4c4f15-660c-3ae3-a442-9abc391d144c/thumbnail-b56a6cfa-122d-4063-91be-e54102971b51-3.png)
![FIG. 4. Target Z dependence of the measured total electron loss cross sections in comparison to calculations performed by Shevelko et al. (DEPOSITþ RICODE) [53] and by Olson et al. (CTMC) [29] as well as to the Z2 þ Z scaling obtained from firstorder perturbation theory (“Born scaling”). Solid lines between the theory data points are drawn to guide the eye. Moreover, the experimental and theory data points for the hydrogen target were slightly shifted against each other along the abscissa.](https://s3-eu-west-1.amazonaws.com/com.mendeley.prod.article-extracted-content/images/3e4c4f15-660c-3ae3-a442-9abc391d144c/thumbnail-02c7903c-ffcc-4155-bad1-dd0b30dafcc8-4.png)
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CITATION STYLE
Weber, G., Herdrich, M. O., DuBois, R. D., Hillenbrand, P. M., Beyer, H., Bozyk, L., … Stöhlker, T. (2015). Total projectile electron loss cross sections of U28+ ions in collisions with gaseous targets ranging from hydrogen to krypton. Physical Review Special Topics - Accelerators and Beams, 18(3). https://doi.org/10.1103/PhysRevSTAB.18.034403
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