Heidelberg 1999 – wissenschaftliches Programm
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A: Atomphysik
A 18: Symposium Hochgeladene Ionen II Poster
A 18.32: Poster
Freitag, 19. März 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. Ludziejewski1,2, Th. St"ohlker1,3, 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.