Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.8: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Nuclear spin effects on the photoionization and radiative recombination of high–Z, hydrogen–like ions — •A. Surzhykov1, S. Fritzsche1, and Th. Stöhlker2 — 1Fachbereich Physik, Universität Kassel, D–34132 Kassel, Germany. — 2Gesellschaft für Schwerionenforschung, D–62491 Darmstadt, Germany.
Collisions of highly charged ions with various (low–Z) target materials at relativistic energies have been studied intensively at the GSI storage ring in Darmstadt during recent years. One major process, which leads to a loss of ions from the beam, is due to the radiative recombination (RR) of a free or quasi–free electron into a bound state of the projectile, accompanied by the simultaneous emission of one (or several) photons. For the angle–differential and total cross sections of this process, a series of measurements have been carried out by Stöhlker and co-workers [1] and are now well understood theoretically [2]. Most experiments, so far, have dealt with ion beams with a zero nuclear spin. For such ions, an exact relativistic description is achieved by using Dirac’s wave functions for the continum and the final bound state of the projectile [2]. In this contribution, instead, we will address the questions: How does a finite (non–zero) nuclear spin affect the behaviour of the cross sections, and can the measurement of these (RR) cross sections, in particular, be utilized to determine the nuclear polarization of the beam ? — Calculations have been carried out for the differential and total cross sections of hydrogen–like Bi ions for a wide range of energies. The behaviour of the spin–flip and non–spin–flip contributions to the cross sections has also been investigated in detail.
[1] Th. Stöhlker et. al Phys. Rev. Lett. 73 (1994) 3520; Th. Stöhlker et. al Phys. Rev. A51 (1995) 2098.
[2] A. Ichihara, T. Shirai and J. Eichler Phys. Rev. A49 (1994) 1875; J. Eichler, W. Meyerhof, Relativistic Atomic Collisions (Academic Press, San Diego, 1995).