Bonn 2025 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Collisions, Scattering and Correlation Phenomena I
A 16.6: Vortrag
Mittwoch, 12. März 2025, 16:00–16:15, HS PC
Polarization effects in the Compton scattering from atomically bound electrons — •Wilko Middents1, 2, 3, Günter Weber1, 2, Tobias Over1, 2, 3, Alexander Gumberidze2, Philip Pfäfflein1, 2, 3, Uwe Spillmann2, and Thomas Stöhlker1, 2, 3 — 1Helmholtz Institute Jena, Jena, Germany — 2GSI, Darmstadt, Germany — 3Friedrich Schiller University Jena, Jena, Germany
Precise studies of the linear polarization for Compton scattered photons open the unique opportunity for a detailed test of the impulse approximation for energetic photon matter interaction. Compton scattering is the inelastic scattering of a photon from an electron, in which the scattered photon carries a lower energy than the incident photon. The energy of the scattered photon depends on the scattering angle. For scattering from bound electrons, the resulting Compton scattering peak is broadened due to the momentum distribution of the electrons leading to a Doppler shift of the incident and scattered photons. Additionally, we expect the electron momentum distribution to influence the scattered photon polarization such, that the linear polarization will vary across the Compton peak.
We performed an experiment at the synchrotron facility PETRA III at DESY in Hamburg, in which we scattered the highly polarized hard x ray beam from a gold target. We analyzed the scattered radiation under several scattering angles with a special interest to the linear polarization of the scattered radiation. We will show the result of the analysis of the Compton scattered radiation and compare it to a simulation developed in the framework of the impulse approximation.
Keywords: scattering; Compton scattering; polarization; hard x rays; impulse approximation