Heidelberg 2015 – scientific programme

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A: Fachverband Atomphysik

A 30: Precision spectroscopy of atoms and ions III (with Q)

A 30.7: Talk

Thursday, March 26, 2015, 12:30–12:45, M/HS1

Search for the ¹P₁ level in ²⁵⁴No in a buffer-gas cell — •Felix Lautenschläger¹, Hartmut Backe², Michael Block^3,4, Bradley Cheal⁵, Premaditya Chhetri¹, Peter Kunz⁶, Fritz-Peter Heßberger^3,4, Mustapha Laatiaoui^3,4, Werner Lauth², Sebastian Raeder⁷, Thomas Walther¹, and Calvin Wraith⁵ — ¹Technische Universität Darmstadt, Deutschland — ²Johannes Gutenberg-Universität Mainz, Deutschland — ³GSI Helmholtzzentrum für Schwerionenforschung GmbH, Deutschland — ⁴Helmholtzinstitut Mainz, Deutschland — ⁵University of Liverpool, Großbritannien — ⁶TRIUMF, Kanada — ⁷Katholieke Universiteit Leuven, Belgien

The atomic structure of the heaviest elements (Z>100) is strongly affected by relativistic effects. Their description in modern Relativistic-Coupled-Clusters and Multi-Configuration-Dirac-Fock theories can be benchmarked by laser spectroscopy of the atomic levels in ²⁵⁴No, which has a simple atomic structure allowing precise predictions of the atomic transitions. At present, no experimental information is available for the atomic levels of ²⁵⁴No. It can be produced using the nuclear fusion reaction ²⁰⁸Pb(⁴⁸Ca,2n)²⁵⁴No. In our experiment, we employ the Radioation Detected Resonance Ionization Spectroscopy in a buffer-gas cell behind the velocity-filter SHIP at GSI. In a recent experiment the search for the predicted 5f¹⁴7s7p ¹P₁ level in ²⁵⁴No has been continued. First results of this measurement campaign will be presented.