Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster: Electron scattering and recombination

A 25.4: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Giant Effect of the Spin-Orbit Interaction in Coulomb Scattering — •Oleksiy Kovtun¹, Stanislav Tashenov¹, Valery Tioukine², Andrey Surzhykov^1,3,4 und Vladimir Yerokhin^1,4,5 — ¹Physikalisches Institut der Universität Heidelberg, Germany — ²Institut für Kernphysik Johannes Gutenberg-Universität Mainz, Germany — ³Helmholtz-Institut Jena, Germany — ⁴GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — ⁵Center for Advanced Studies, St. Petersburg State Polytechnical University, Russia

Coulomb scattering of an electron in the field of the nucleus is influenced by the spin-orbit interaction. Due to the orbital momentum precession the electron trajectory is not confined to a single scattering plane as evidenced by the recent bremsstrahlung experiments. In that the angle of bremsstrahlung linear polarization is correlated with the spin direction of the incoming electron [S. Tashenov PRL 107, 173201 (2011), R. Maertin PRL 108, 264801 (2012)]. In the recent experiment we found this effect to be dramatically enhanced at relativistic energies. The scattering plane was turning by as much as several tenth of degrees. The results are in agreement with the full-order relativistic calculations. For this experiment we applied the novel techniques of the pulse shape analysis of the germanium detector signals and gamma-ray Compton imaging. The principles of the Compton imaging were invented in 1973 and our experiment marked their first application in a laboratory physics experiment.