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Department für Physik • Michael Sewtz

Department für Physik • Michael Sewtz. Joint Research Activity. 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

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Department für Physik • Michael Sewtz

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  1. Department für Physik • Michael Sewtz Joint Research Activity Quantum Heavies From Hot Fusion to Ultracold Ions M. Block1, M. Drewsen2, S. Fritzsche1, D. Habs3, Y.T. Oganessian4, U. Kaldor5, G. Saathoff6, M. Sewtz3, and Th. Udem6 1GSI-Darmstadt, Germany 2University of Aarhus, Denmark 3LMU –München, Germany 4FLNR-JINR,Dubna, Russia 5Tel Aviv University, Israel 6MPQ-Garching, Germany

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

  3. a Problem : - Metastable States Laser Induced Absorption and Emission |1> Solution : CCD |0> 108 Fluorescence Photons per Second and Ion 105 Photons/s on CCD Quantum Heavies Motivation II Motivation II Problem : - Long-Lived - Stable Nuclides or - Spontaneous Fission 268Db t1/2 = 23 h 267Db t1/2 = 1.2 h 267Rf t1/2 = 2.3 h a-Decay of one Nuclide SHE 3 edet ~ 0.9 Counts 0 a-Energy Semiconducor Detector Buffer Gas Quenching G. Werth, Topical Issue of Eur. Phys. J. D, Backe, Habs, Sewtz, Türler, edts. DOI: 10.1140/epjd/e2007-00149-x Spectroscopy Using Quantum Logic D.J. Wineland et al., Science 309, 749 (2005) Michael Sewtz EURONS-EURISOL Town Meeting, Helsinki 17-19 September 2007 Folie 3

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

  5. 12000 K 1eV 0.5 mK A n Quantum Heavies Experimental Method j t = 8 ns Trap Potential 6P1/2 650 nm 1) Sympathetic Cooling 493 nm 5D3/2 t = 83 s 6S1/2 z Ba+ for Sympathetic Cooling 3) Spectroscopy 2) Mass selective Detection RF-Excitation of SHE+ Photon Recoil Detunes Logic Ion Spectroscopy Ion Logic Ion SHE+ Ion Michael Sewtz EURONS-EURISOL Town Meeting, Helsinki 17-19 September 2007

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