Magnetic-sublevel population and alignment for the excitation of H- and He-like uranium in relativistic collisions

作者：Gumberidze, A.^*; Fritzsche, S.; Hagmann, S.; Kozhuharov, C.; Ma, X.; Steck, M.; Surzhykov, A.; Warczak, A.; Stoehlker, Th.

来源：Physical Review A, 2011, 84(4): 042710.

DOI：10.1103/PhysRevA.84.042710

• K-SHELL EXCITATION
• ELECTRON-CAPTURE
• PROJECTILE EXCITATION
• PAIR-PRODUCTION
• IONIZATION
• HEAVY
• IONS
• PROTONS
• HELIUM
• ATOMS

We have measured the alignment of the L-shell magnetic substates following the K-shell excitation of hydrogen- and helium-like uranium in relativistic collisions with a low-Z gaseous target. Within this experiment, the population distribution for the L-shell magnetic sublevels has been obtained via an angular differential study of the decay photons associated with the subsequent deexcitation process. The results show a very distinctive behavior for the H- and He-like heavy systems. In particular, for K -> L excitation of He-like uranium, a considerable alignment of the L-shell levels was observed. A comparison of our experimental findings with recent rigorous relativistic predictions provides a good qualitative and a reasonable quantitative agreement, emphasizing the importance of the magnetic-interaction and many-body effects in the strong-field domain of high-Z ions.

• 出版日期2011-10-17