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A: Atomphysik

A 18: Symposium Hochgeladene Ionen II Poster

A 18.32: Poster

Friday, March 19, 1999, 15:00–16:30, PY

Angular Distribution Studies for the Time-Reversed Photoeffect in H-like Uranium: The Identification of Spin-Flip Transitions — •T. Ludziejewski^1,2, Th. St"ohlker^1,3, J. Eichler⁴, A. Ichihara⁵, T. Shirai⁵, F. Bosch¹, H.F. Beyer¹, A. Griegal⁶, A. Kr"amer¹, D. Liesen¹, P.H. Mokler¹, H. Reich¹, Z. Stachura⁷, P. Świat⁸, and A. Warczak⁸ — ¹Gesellschaft f"ur Schwerionenforschung Darmstadt — ²The Andrzej Sołtan Institute for Nuclear Studies — ³Institut f"ur Kernphysik, Universit"at Frankfurt — ⁴BTP-HMI Berlin — ⁵JAERI Tokai-mura Ibaraki, Japan — ⁶Dept. of Physics, New Jersey College, USA — ⁷Institute of Nuclear Physics, Cracow, Poland — ⁸Jagellonian University, Cracow, Poland

The K-shell photoelectric effect for H-like U⁹¹⁺ ion is studied by its time reversed process occuring in relativistic collisions between bare uranium ions and low-Z target atoms. In this time reversed analogue of the photoelectric process, an electron is captured into the 1s state with the simultaneous emission of the photon (K-REC). The study of angular distribution of K-REC photons is presented. The observation of photons at angles close to 0^∘ allowed us to identify the spin-flip contribution and to determine its relative strength. Moreover, by normalizing to the simultaneously measured Lyman α₂ series transitions, the electron angular distribution for K-shell photoionization of H-like uranium is determined from the experimental data.