1. Department für Physik Michael Sewtz Quantum Heavies From Hot Fusion to Ultracold Ions M. Block 1, M. Drewsen 2, S. Fritzsche 1, D. Habs 3, Y.T. Oganessian 4, U. Kaldor 5, G. Saathoff 6, M. Sewtz 3, and Th. Udem 6 1 GSI-Darmstadt, Germany 2 University of Aarhus, Denmark 3 LMU –München, Germany 4 FLNR-JINR,Dubna, Russia 5 Tel Aviv University, Israel 6 MPQ-Garching, Germany Joint Research Activity

2. Michael Sewtz EURONS-EURISOL Town Meeting, Helsinki 17-19 September 2007 Motivation I Folie 2 Development of a Technique for Optical Spectroscopy at Single Ions Quantum Heavies as Detection Method for Optical Transitions in Unknown Ions Superheavy Element - Detection - Identification (Z,A) -Investigation (Optical Spectroscopy) Environmental Applications Quantum Logic

3. Michael Sewtz EURONS-EURISOL Town Meeting, Helsinki 17-19 September 2007 Motivation II -Decay of one Nuclide Folie 3 Quantum Heavies Counts -Energy 3 0 SHE Semiconducor Detector det ~ 0.9 Problem : - Long-Lived - Stable Nuclides or - Spontaneous Fission 268 Db t 1/2 = 23 h 267 Db t 1/2 = 1.2 h 267 Rf t 1/2 = 2.3 h Motivation II CCD 10 8 Fluorescence Photons per Second and Ion 10 5 Photons/s on CCD Problem : - Metastable States Solution : |0> |1> Laser Induced Absorption and Emission Spectroscopy Using Quantum Logic D.J. Wineland et al., Science 309, 749 (2005) Buffer Gas Quenching G. Werth, Topical Issue of Eur. Phys. J. D, Backe, Habs, Sewtz, Türler, edts. DOI: 10.1140/epjd/e2007-00149-x

4. Quantum Heavies Experimental Setup Michael Sewtz EURONS-EURISOL Town Meeting, Helsinki 17-19 September 2007Folie 4 Primary Beam SHE Target Recoil Separator + + + Buffer Gas Stopping Cell Quantum Logic Fluorescence Spectroscopy Trapped SHE + 60 mbar Argon 10 -5 mbar 10 -10 mbar10 -11 mbar Differential Pumping Sympathetic Cooling

5. Quantum Heavies Experimental Method Michael Sewtz EURONS-EURISOL Town Meeting, Helsinki 17-19 September 2007 Trap Potential z 6S 1/2 6P 1/2 5D 3/2 493 nm 650 nm = 83 s = 8 ns Ba + for Sympathetic Cooling 12000 K 1eV 1) Sympathetic Cooling Spectroscopy Ion Logic Ion 2) Mass selective Detection 0.5 mK A RF-Excitation of SHE + 3) Spectroscopy Photon Recoil Detunes Logic Ion SHE + Ion