SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 2: Collisions, Scattering and Correlation Phenomena
A 2.4: Vortrag
Montag, 6. März 2023, 11:45–12:00, F107
Calculations of Delbrück scattering to all orders in αZ — •Jonas Sommerfeldt1,2, Vladimir Yerokhin3, and Andrey Surzhykov1,2 — 1Physikalisch Technische Bundesanstalt, D-38116 Braunschweig, Germany — 2Technische Universität Braunschweig, D-38106 Braunschweig, Germany — 3Max-Planck Institut für Kernphysik, D-69117 Heidelberg, Germany
Delbrück scattering is the process in which photons are elastically scattered by the electric field of an atomic nucleus via the production of virtual electron-positron pairs. It is one of the few non-linear quantum electrodynamical processes that can be observed experimentally [1] and, hence, testing the respective theoretical predictions serves as an important test of QED in strong electromagnetic fields. Despite the strong motivation for the theoretical analysis of Delbrück scattering, most of the previous studies have been limited to some approximation regarding the coupling between the virtual electron positron pair and the nucleus leading to large disagreements between theory and experiment for certain parameter regimes [2]. In this contribution, therefore, we present an efficient approach to calculate amplitudes for Delbrück scattering that accounts for the interaction with nucleus to all orders including the Coulomb corrections [3].
[1] M. Schumacher, Radiat. Phys. Chem. 56 (1999) 101-111
[2] P. Rullhusen et al., Z Physik A 293 (1979) 287-292
[3] J. Sommerfeldt et al., Phys. Rev. A 105 (2022) 02280