Hannover 2013 – scientific programme
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A: Fachverband Atomphysik
A 10: Precision spectroscopy of atoms and ions II (with Q)
A 10.4: Talk
Monday, March 18, 2013, 17:15–17:30, F 428
Towards Radiation Detected Resonance Ionization Spectroscopy on transfermium elements in a buffer gas cell — •Felix Lautenschläger1, Mustapha Laatiaoui2,3, Michael Block2,3, Werner Lauth4, Hartmut Backe4, Thomas Walther1, and Fritz-Peter Hessberger2 — 1Institut für Angewandte Physik, TU Darmstadt, 64289 Darmstadt — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt — 3Helmholtzinstitut Mainz, 55128 Mainz — 4Institut für Kernphysik, JGU Mainz, 55128 Mainz
The study of the atomic structure of transfermium elements like nobelium (No) and lawrencium (Lr) via Radiation Detected Resonance Ionization Spectroscopy (RADRIS) is one of the most fascinating disciplines of modern atomic physics. It allows the determination of relativistic effects at the heaviest elements and provides a critical test of theoretical predictions. For these transfermium elements no experimental data on atomic level schemes are available at present.
First experiments on 254No were performed in 2007, in which a buffer gas cell with an overall efficiency of 1% [H. Backe et al., Eur. Phys. J. D 45 (2007) 99] was employed. In this experiment the evaporation temperature of nobelium was determined for the first time. To increase the efficiency of the buffer gas cell, off-line measurements have been performed with nat. ytterbium, the chemical homologue of nobelium. Also on-line experiments during a parasitic beamtime in 2012 provided an insight into the critical parameters of our setup. The results of the off-line and on-line measurements are briefly summarized in this talk.