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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 Schneider^1,2, Daniel Fischer¹, Michael Schulz³, Marcelo Ciappina⁴, Manfred Grieser¹, Siegbert Hagman⁵, Aditya Kelkar^1,2, 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.