Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Collisions, Scattering and Correlation Phenomena II (joint session A/MO)
A 7.7: Vortrag
Montag, 2. März 2026, 18:30–18:45, N 2
A Novel Compton Telescope for Polarimetry in the MeV Range: Towards Delbrück Scattering — •Tobias Over-Winter1,2,3, Anton Kononov1, Thomas Krings4, Wilko Middents1,2,3, Uwe Spillmann1, Günter Weber1,2, and Thomas Stöhlker1,2,3 — 1Helmholtz Institute Jena, Jena, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 3Friedrich Schiller University Jena, Jena, Germany — 4Forschungs Zentrum Jülich, Jülich, Germany
For photon energies from several tens of keV up to a few MeV, Compton polarimetry provides insight into subtle details of fundamental radiative processes in atomic physics. Within the SPARC collaboration [1] several segmented semiconductor detectors have been developed that are well suited for application as efficient Compton polarimeters. For scattering and photon emission processes in the hard x-ray regime this kind of detector enable revealing photon polarization effects in great detail [2]. Recently, a new polarimeter has been constructed within the SPARC collaboration based on an arrangement of two segmented semiconductor crystals in a telescope structure. This design allows us to employ the Compton polarimeter in a broad energy range of photon energies from 50 keV up to 1 MeV. In my contribution I will present this detector. Additionally, I will discuss first planned experiments utilizing this detector at high photon energies up to 1 MeV.
[1] Th. Stöhlker et al. Nucl. Instrum. Methods Phys. Res. B 365 (2015) 680.
[2] K.H. Blumenhagen et al. New J. Phys. 18 (2016) 119601.
Keywords: Compton scattering; Compton polarimetry; polarization; hard x-rays