Role of the Coulomb Potential in Compton Scattering
N. Melzer, M. Kircher, A. Pier, L. Kaiser, J. Kruse, N. Anders, J., Stindl, L. Sommerlad, D. McGinnis, M. Schmidt, L. Nowak, A. K\"ugler, I., Dwojak, J. Drnec, F. Trinter, M. S. Sch\"offler, L. Ph. Schmidt, N. M., Novikovskiy, Ph. V. Demekhin, T. Jahnke, R. D\"orner
TL;DR
This study investigates how the Coulomb potential influences electron emission during Ne L-shell ionization by 20 keV photon Compton scattering, revealing electron-nucleus scattering and Coulomb focusing effects.
Contribution
It provides a fully differential analysis highlighting two new physical mechanisms affecting Compton-electron emission due to Coulomb interactions.
Findings
Observation of Compton electron scattering at the parent nucleus
Identification of a zero-momentum electron peak due to Coulomb focusing
Enhanced understanding of Coulomb effects in photon-induced ionization
Abstract
We report a fully differential study of ionization of the Ne L-shell by Compton scattering of 20 keV photons. We find two physical mechanisms which modify the Compton-electron emission. Firstly, we observe scattering of the Compton electrons at their parent nucleus. Secondly, we find a distinct maximum in the electron momentum distribution close-to-zero momentum which we attribute to a focusing of the electrons by the Coulomb potential.
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