Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.36: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
First results from the In-Ring Reaction Microscope at the TSR of MPIK — •Katharina Schneider1,2, Daniel Fischer1, Michael Schulz3, Marcelo Ciappina4, Manfred Grieser1, Siegbert Hagman5, Aditya Kelkar1,2, Tom Kirchner6, Kai-Uwe Kühnel1, Xincheng Wang1, Robert Moshammer1, and Joachim Ullrich1 — 1MPI für Kernphysik, Heidelberg, Germany — 2EMMI at GSI, Darmstadt, Germany — 3Missouri University of Science and Technology, Rolla, USA — 4Institute of High Performance Computing, Singapore — 5GSI, Darmstadt, Germany — 6York University, Toronto, Canada
A Reaction Microscope, which enables fully momentum resolved measurements of ionization and charge transfer processes in ion-atom collisions, is implemented in the ion storage ring TSR at the MPIK. Due to the low beam emittance and high intensity achievable in the TSR, the collision dynamics can be studied with high statistics and very good resolution, even on the level of fully differential cross sections. In first measurements, double ionization of helium was studied over a wide range of perturbation parameters η (projectile charge to velocity ratio) and analyzed by means of so-called four-particle Dalitz plots. It is shown that for large η, as expected, the data can best be described by a process not involving the electron-electron correlation. In an upcoming beamtime we aim at kinematically complete measurements for radiative electron capture (REC) in ion-atom collisions, the dominant process for electron transfer at high collision velocities.