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Université de Fribourg

Subshell-selective x-ray studies of radiative recombination of ${\mathrm{U}}^{92+}$ ions with electrons for very low relative energies

Banaś, D. ; Pajek, M. ; Surzhykov, A. ; Stöhlker, Th. ; Brandau, C. ; Gumberidze, A. ; Kozhuharov, C. ; Beyer, H. F. ; Böhm, S. ; Bosch, F. ; Czarnota, M. ; Chatterjee, S. ; Dousse, Jean-Claude ; Fritzsche, S. ; Hagmann, S. ; Liesen, D. ; Mokler, P. H. ; Müller, A. ; Kumar, A. ; Reuschl, R. ; Sierpowski, D. ; Spillmann, U. ; Szlachetko, Jakub ; Tashenov, S. ; Trotsenko, S. ; Verma, P. ; Warczak, A.

In: Physical Review A, 2015, vol. 92, no. 3, p. 032710

Radiative recombination (RR) into the K shell and L subshells of U92+ ions interacting with cooling electrons has been studied in an x-ray RR experiment at the electron cooler of the Experimental Storage Ring at GSI. The measured radiative recombination rate coefficients for electron-ion relative energies in the range 0–1000 meV demonstrate the importance of relativistic effects. The...

Université de Fribourg

Enhanced radiative recombination of U⁹²⁺ ions with cooling electrons for the K-shell

Banaś, D. ; Beyer, H .F. ; Bosch, F. ; Brandau, C. ; Böhm, S. ; Chatterjee, S. ; Czarnota, M. ; Dousse, Jean-Claude ; Gumberidze, A. ; Hagmann, S. ; Kozhuharov, C. ; Liesen, D. ; Mokler, P. H. ; Müller, A. ; Kumar, A. ; Pajek, M. ; Reuschl, R. ; Schmidt, E. W. ; Sierpowski, D. ; Spillmann, U. ; Surzhykov, A. ; Stöhlker, Th. ; Szlachetko, Jakub ; Tashenov, S. ; Trotsenko, S. ; Verma, P. ; Warczak, A.

In: Journal of Physics: Conference Series, 2012, vol. 388, no. 6, p. 062044

Observed enhancement of K-shell radiative recombination (RR) of bare uranium ions with cooling electrons is interpreted in terms of of distant transverse collisions in magnetized electron-cooler plasma described within the semiclassical geometrical model (SGM), which was recently proposed. The Monte Carlo simulations based on the proposed approach explains the enhancement measured in RR of...

Université de Fribourg

Crystal optics for hard-X-ray spectroscopy of highly charged ions

Beyer, H.F. ; Attia, D. ; Banas, D. ; Bigot, E.-O. Le ; Bosch, F. ; Dousse, Jean-Claude ; Förster, E. ; Gumberidze, A. ; Hagmann, S. ; Heß, S. ; Hoszowska, Joanna ; Indelicato, P. ; Jagodzinski, P. ; Kozhuharov, Chr. ; Krings, Th. ; Liesen, D. ; Ma, X. ; Manil, B. ; Mohos, I. ; Pajek, M. ; Protić, D. ; Reuschl, R. ; Rzadkiewicz, J. ; Simionovici, A. ; Spillmann, U. ; Stachura, Z. ; Stöhlker, Th. ; Trassinelli, M. ; Trotsenko, S. ; Warczak, A. ; Wehrhan, O. ; Ziegler, E.

In: Spectrochimica Acta Part B: Atomic Spectroscopy, 2009, vol. 64, no. 8, p. 736-743

A twin crystal-spectrometer assembly, operated in the focusing compensated asymmetric Laue geometry has been developed for accurate spectroscopy of fast highly charged heavy ions in the hard-X-ray region. Coupled to the focusing crystal optics is a specially developed two-dimensional position-sensitive X-ray detector which is necessary for retaining spectral resolution also for fast moving...

Université de Fribourg

Performance of a Ge-microstrip imaging detector and polarimeter

Spillmann, U. ; Bräuning, H. ; Hess, S. ; Beyer, H. ; Stöhlker, Th. ; Dousse, Jean-Claude ; Protic, D. ; Krings, T.

In: Review of Scientific Instruments, 2008, vol. 79, no. 2, p. 083101

Using 98% linearly polarized radiation at the European Synchrotron Radiation Facility in Grenoble, the performance of a prototype two-dimensional microstrip Ge(i) detector for x-ray imaging and as a Compton polarimeter has been evaluated. Using the energy and position sensitivity of the detector, the ability to obtain a complete reconstruction of the Compton event has been demonstrated. The...

Université de Fribourg

The enhancement effect in K-shell radiative recombination of U⁹²⁺ ions with cooling electrons

Banaś, D. ; Pajek, M. ; Stöhlker, Th. ; Beyer, H. F. ; Böhm, S. ; Bosch, F. ; Brandau, C. ; Czarnota, M. ; Chatterjee, S. ; Dousse, Jean-Claude ; Fritzsche, S. ; Gumberidze, A. ; Hagmann, S. ; Kozhuharov, C. ; Kumar, A. ; Liesen, D. ; Mokler, P. H. ; Müller, A. ; Reuschl, R. ; Schmidt, E. W. ; Sierpowski, D. ; Spillmann, U. ; Surzhykov, A. ; Szlachetko, Jakub ; Tashenov, S. ; Trotsenko, S. ; Verma, P. ; Warczak, A.

In: The European Physical Journal: Special Topics, 2009, vol. 169, no. 1, p. 15-18

We report the results of the x-ray radiative recombination (RR) experiment at the electron cooler of the ESR storage ring performed, for the first time, for detuned (off- cooling) electron energies. In this experiment the recombination of stored, decelerated bare uranium ions with electrons in the energy range 0–1000 meV was studied by observing K-RR x-ray photons emitted from direct...

Université de Fribourg

A 2D position sensitive germanium detector for spectroscopy and polarimetry of high-energetic x-rays

Stöhlker, Th. ; Spillmann, U. ; Banas, D. ; Beyer, H. F. ; Dousse, Jean-Claude ; Chatterjee, S. ; Hess, S. ; Kozhuharov, C. ; Kavčič, Matjaz ; Krings, T. ; Protic, D. ; Reuschl, R. ; Szlachetko, Jakub ; Tashenov, S. ; Trotsenko, S.

In: Journal of Physics: Conference Series, 2007, vol. 58, no. 1, p. 411-414

We report on a first prototype 2D μ-strip germanium detector, developed at IKP-Jülich, and its performance test at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. Beside an accurate determination of the detector response function, the polarization sensitivity has been addressed in this study. For this purpose photon beams at energies of 60 keV and 210 keV have been...

6 results 1