Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 22: Electron scattering and recombination I

A 22.2: Talk

Thursday, March 17, 2011, 14:30–14:45, BAR 106

Spin dynamics of electrons in strong fields studied via bremsstrahlung from a polarized electron beam — •Stanislav Tashenov^1,2,3, Torbjörn Bäck¹, Roman Barday⁴, Bo Cederwall¹, Joachim Enders⁴, Anton Khaplanov¹, Yuliya Poltoratska⁴, Kai-Uwe Schässburger¹, and Andrey Surzhykov^3,5 — ¹Royal Institute of Technology, Stockholm, Sweden — ²Stockholm University, Sweden — ³Physikalisches Institut der Universität Heidelberg, Germany — ⁴Institut für Kernphysik, Technische Universität Darmstadt, Germany — ⁵GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

Linear polarization of the photons emitted in the process of the atomic field electron bremsstrahlung has been studied at the newly developed 100 keV polarized electron source of TU Darmstadt. A correlation between the initial orientation of the electron spin and the degree and the angle of photon linear polarization has been measured for the first time. For this purpose a hard x-ray Compton polarimeter consisting of a segmented high purity germanium detector and an external passive photon scattering target have been applied. Linear polarization sensitive Compton and Rayleigh photon scattering distributions have been sampled by the segmented detector. The observed polarization correlation reveals a precession of the electron spin as it moves in the field of the nucleus. The full-relativistic calculations for the case of radiative recombination into a Rydberg series limit have been corroborated by the measurement. The results of this experiment suggest a new method for electron beam polarimetry.