Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Poster: Precision spectroscopy of atoms and ions
A 21.3: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.V
Radiation Detection Resonance Ionisation Spectroscopy on Nobelium in a buffer gas cell - state of actual development and progess in 2012 — •F. Lautenschläger1, M. Laatiaoui1,2, Th. Walther1, M. Block2, W. Lauth3, H. Backe3, and F.P. Heßberger2 — 1Laser und Quantenoptik, Institut für Angewandte Physik, Technische Universität Darmstadt, 64289 Darmstadt — 2Gesellschaft für Schwerionenforschung GmbH, 64291 Darmstadt — 3Institut für Kernphysik der Universität Mainz, 55099 Mainz
A novel technique for exploration of the atomic structure of heavy elements has been developed. Based on the Radiation Detection Resonance Ionisation Spectroscopy, it is possible to investigate even isotopes with small half-liveslike nobelium, which can be produced with small rates of a few atoms per second at on-line facilities such as GSI/Darmstadt. After separation from the primary beam by the velocity filter SHIP, the fusion products enter a buffer gas cell, where they are stopped and collected on a tantalum filament. The next step is to re-evaporate the atoms and to ionize them with tunable lasers. Finally the ions will be identified by their characteristic α - decay. First online experiments were performed on Ytterbium and an efficiency of about 1% was obtained. For further improvements, a realistic simulation of the buffer gas cell has been performed. Some results of the simulation and off-line tests will be presented.