May 11 – 16, 2014
Casino Conference Centre
Europe/Prague timezone

Decomposition studies of W and Mo carbonyl complexes and their implications for future experiments with Sg(CO)6

May 12, 2014, 2:00 PM
15m
Red Hall (Casino Conference Centre)

Red Hall

Casino Conference Centre

Reitenbergerova 4/95, Mari&#225;nsk&#233; L&#225;zn&#283;, Czech Republic <font color=white>
Verbal Chemistry of Actinide and Trans-actinide Elements Chemistry of Actinide and Trans-actinide Elements 1

Speaker

Ilya Usoltsev (Paul Scherrer Institut)

Description

Recent experiments at RIKEN (Japan) showed that Sg carbonyl (Sg(CO)6) can be produced with yields high enough for experimental investigation of its chemical properties [1]. According to theoretical calculations [2], which include so-called relativistic effects, Sg(CO)6 is expected to be slightly more stable than W(CO)6. In this work we aimed at designing an experimental setup for testing this theoretical prediction. Carbonyl complexes of W and Mo, as lighter homologues of Sg, were chosen for testing the setup. Gas-jet systems as well as the detection system used in our work are described in [1]. Two alpha-active tungsten isotopes were produced in fusion-evaporation reactions 144Sm(24Mg,xn)163-164W, while natZn(24Mg,xn)87-88W allowed for formation of β+-decaying molybdenum. The Gas-filled Recoil Ion Separator (GARIS) provided an effective separation of evaporation residues from the beam and from multinucleon transfer reaction products. Evaporation residues were thermalized in a recoil transfer chamber [3], flushed by a He/CO gas mixture. Formed carbonyl products [4] were transported to a decomposition column, held at different temperatures, and bypassed by a column of the same size made of PFA Teflon. Complexes transported through this bypass or the decomposition column were deposited at the low-temperature end of the COMPACT detector [1] according to their adsorption enthalpy and thus provided quantitative information about the production and the decomposition rates, respectively. Obtained results are discussed in the light of future experiments with Sg(CO)6. [1] J. Even et al., in preparation , and A. Yakushev, presentation at this conference. [2] C. S. Nash and B. E. Bursten, J. Am. Chem. Soc. 121, 10830-10831 (1999). [3] J. Even et al., Nucl. Instrum. Meth. A 638, 157-164 (2011). [4] J. Even et al., Inorg.Chem. 2012, 51, 6431-6422.

Primary authors

Ilya Usoltsev (Paul Scherrer Institut) Robert Eichler (Paul Scherrer Institut)

Co-authors

Alexander Yakushev (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Andreas Türler (Paul Scherrer Institut) Antonio Di Nitto (Johannes Gutenberg-Universität Mainz) Atsushi Toyoshima (Advanced Science Research Center, Japan Atomic Energy Agency) Bettina Lommel (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Birgit Kindler (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Christoph Düllmann (Helmholtz-Insitut Mainz) Daiya Kaji (Nishina Center for Accelerator-Based Science, RIKEN) Egon Jäger (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Fan Fangli (Institute of Modern Physics Lanzhou) Heino Nitsche (University of California, Berkeley) Hiro Haba (Nishina Center for Accelerator-Based Science, RIKEN) Holger Brand (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Jadambaa Khuyagbaatar (Helmholtz-Insitut Mainz) Jens Kratz (Johannes Gutenberg-Universität Mainz) Joerg Krier (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Julia Even (Helmholtz-Insitut Mainz) Jumpei Kanaya (Nishina Center for Accelerator-Based Science, RIKEN) Jutta Steiner (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Katsuhiro Ooe (Niigata University, Niigata, Niigata) Kazuaki Tsukada (Advanced Science Research Center, Japan Atomic Energy Agency) Kengo Tanaka (Nishina Center for Accelerator-Based Science, RIKEN) Kosuke Morita (Nishina Center for Accelerator-Based Science, RIKEN) Kouji Morimoto (Nishina Center for Accelerator-Based Science, RIKEN) Masashi Murakami (Nishina Center for Accelerator-Based Science, RIKEN) Masato Asai (Advanced Science Research Center, Japan Atomic Energy Agency) Matthias Schädel (Advanced Science Research Center, Japan Atomic Energy Agency) Minqhiu Huang (Nishina Center for Accelerator-Based Science, RIKEN) Mirei Takeyama (Nishina Center for Accelerator-Based Science, RIKEN) Nikolaus Kurz (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Norbert Wiehl (Helmholtz-Insitut Mainz) Qin Zhi (Institute of Modern Physics Lanzhou) Sayaka Yamaki (Nishina Center for Accelerator-Based Science, RIKEN) Sunao Miyashita (Advanced Science Research Center, Japan Atomic Energy Agency) T. Sumita (Nishina Center for Accelerator-Based Science, RIKEN) Tetsuya Sato (Advanced Science Research Center, Japan Atomic Energy Agency) Willi Hartmann (GSI Helmholtzzentrum für Schwerionenforschung GmbH) Yang Wang (Institute of Modern Physics Lanzhou) Yuichiro Nagame (Advanced Science Research Center, Japan Atomic Energy Agency) Yuki Kudou (Nishina Center for Accelerator-Based Science, RIKEN) Yusuke Kaneya (Advanced Science Research Center, Japan Atomic Energy Agency) yasuo Wakabayashi (Nishina Center for Accelerator-Based Science, RIKEN)

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