Towards optical spectroscopy of the element nobelium ({\sf Z }= \mathsf{102}) in a buffer gas cell |
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Authors: | H Backe P Kunz W Lauth A Dretzke R Horn T Kolb M Laatiaoui M Sewtz D Ackermann M Block F Herfurth F P Heßberger S Hofmann R Mann |
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Institution: | 1. Institut für Kernphysik der Universit?t Mainz, 55099, Mainz, Germany 2. Department für Physik, Ludwig-Maximilians-Universit?t München, 85748, Garching, Germany 3. Gesellschaft für Schwerionenforschung, 64291, Darmstadt, Germany
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Abstract: | For the investigation of the atomic level structure of
heavy elements which can only be produced at on-line facilities
such as GSI, a novel experimental procedure has been developed. It
is based on Radiation Detected Resonance Ionization Spectroscopy
(RADRIS) and can be applied to elements like nobelium produced at
rates of a few ions per second. Fusion reaction products are
separated from the primary beam by the velocity filter SHIP at
GSI, stopped in a buffer gas cell, collected on a tantalum
filament and then re-evaporated as atoms. The ions produced by
resonance ionization with tunable laser beams are detected via
their characteristic α decay. First on-line experiments on
α-active 155Yb, which is supposed to have an atomic
level structure similar to nobelium, were performed. These test
experiments focused on the optimization of the collection and
re-evaporation process of the radioactive ions, the laser
ionization efficiency and the detection via α decay. An
overall efficiency for RADRIS of 0.8% with respect to the target
production rate was measured. While further improvements of this
efficiency are in progress it should already be sufficient for the
search for atomic levels in nobelium. |
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Keywords: | PACS" target="_blank">PACS 31 10 +z Theory of electronic structure electronic transitions and chemical binding 32 80 Rm Multiphoton ionization and excitation to highly excited states 32 30 -r Atomic spectra 27 90 +b 220≤ A |
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