Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster I

A 8.37: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

Characterization of the liquid droplet target beam at the ESR — •Nikolaos Petridis¹, Thomas Stoehlker², and Robert E. Grisenti¹ — ¹Institut fuer Kernphysik, JWG-Universität Frankfurt, Germany — ²GSI, Darmstadt, Germany

At storage rings, atomic processes with small cross-sections (e.g. excitation) can only be studied efficiently when high-density targets are available, in spite of the fact that the ions collide several million times per second with the target. Even state-of-the-art internal targets, which are usually realized by expanding a gas through a nozzle into vacuum, provide target gas densities that are generally still too low. For many nuclear and atomic physics experiments, such as those planned at future facilities like FAIR, this is still a problem. Recently, we have successfully employed a novel cryogenically cooled liquid droplet beam source, and demonstrated that target densities of at least one order of magnitude higher, as compared to previous internal targets, are now experimentally feasible. In order to fully characterize the liquid target beam, we have carried out extensive investigations on ion beam heating and losses during the interaction of the droplets with relativistic hydrogen- and lithium-like uranium ions. Here, we will present the experimental data that are presently being analyzed, and discuss the possible use of droplets for the investigation of fully unexplored collision phenomena. For, the interaction of relativistic highly-charged heavy ions with droplets can, in some respect, be compared to that of intense ultra-short laser-cluster interactions.