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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Poster
HK 49.24: Poster
Donnerstag, 15. März 2007, 16:00–17:00, P
Development of a Drift Time Spectrometer for Heavy Element Research — •Mustapha Laatiaoui1, Dieter Habs1, Michael Sewtz1, Hartmut Backe2, Werner Lauth2, Peter Kunz2, and Achim Dretzke2 — 1Department für Physik, LMU-München, D-85748 Garching, Germany — 2Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany
Atomic and chemical properties of the heaviest elements are strongly influenced by relativistic effects. Calculations of the theoritical atomic radii show the relativistic contraction of the valence orbitals and different trends for different electronic configurations.
The most direct method to probe these calculations may be the ion mobility spectrometry. This technique is well established for stable elements to determine the ionic mobility K by the drift time of the ions along electric field lines inside a noble gas filled buffer gas cell. Using the most simple rigid sphere model for collisions between ions and buffer gas atoms, ionic radii can be inferred from the collision cross section, which is inverse proportional to K.
Due to the low production rates and short half-lifes of the heaviest elements, an ultra-sensitive experimental setup is needed to probe theoritical predictions from state-of-the-art MCDF- and RCC-atomic calculations.
An experimental setup will be presented, which will allow for the determination of ion mobility of instable nuclei with a precision of Δ K/K<10−2. Furthermore, different models for the description of ion-atom interaction in the gas phase will be discussed.