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A: Atomphysik
A 10: Poster I: Wechselwirkung mit Elektronen und Ionen
A 10.18: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
Effects of the target polarization on the diagnostics of spin-polarized ion beams at storage rings — •Andrey Surzhykov1 and Stephan Fritzsche2 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Universität Kassel, Kassel, Germany
During the last years, experiments with spin–polarized heavy ion beams at storage rings have attracted substantial interest in atomic, nuclear and high–energy physics. Apart from the production of polarized ions, any practical realization of such experiments requires also an effective tool for the diagnostics of the beam polarization. Recently, we have proposed to utilize the radiative capture of a target electron into a bound states of the projectile ions (REC) as a "polarization probe" process. In particular, we demonstrated that the linear polarization of the recombination x–ray photons is uniquely defined by the spin state of the ion beam [1]. This important result, however, was obtained by assuming that the target electrons are themselves unpolarized. The emphasis on unpolarized electrons seems to be appropriate for nowadays collision studies, but experiments with polarized targets are likely to be performed at the GSI facility in Darmstadt in forthcoming years. In our presentation, therefore, we discuss how a (non–zero) target polarization may affect the linear polarization of the recombination photons and, hence, may result in some uncertainties concerning the spin-diagnostics of the ion beams. Detailed calculations are presented for the capture of polarized electrons by polarized (hydrogen–like) ions, using a wide range of nuclear charges and projectile energies.
[1] A. Surzhykov et al., Phys. Rev. Lett. 94, 203202 (2005).