Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Poster Session II
A 26.39: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG1
Sum rules for the polarization correlations in electron-nucleus bremsstrahlung — •Doris Jakubassa-Amundsen1 and Richard Pratt2 — 1Mathematisches Institut, LMU Munich, Germany — 2Department of Physics and Astronomy, University of Pittsburgh, USA
The knowledge of polarization transfer from a spin-polarized beam electron to the emitted bremsstrahlung photon is important for beam diagnostics or for the production of polarized positrons in conversion targets. Allowing for an arbitrary direction of the electron spin, the polarization transfer is characterized by seven parameters in the case of coplanar geometry. The squares of these parameters obey a strict sum rule, irrespective of the atomic or nuclear interaction potential, which can be used to test the accuracy of the calculations. Approximate sum rules connecting only three parameters can help to determine one particular polarization correlation if the other two are known. Examples for light and heavy nuclei bombarded with electrons in the MeV region will be given, based on the partial-wave Dirac theory for bremsstrahlung.