Heidelberg 2015 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 2: Precision Mass Spectrometry 2
MS 2.6: Talk
Monday, March 23, 2015, 16:00–16:15, PH/HS2
Performance of the Cryogenic Buffer-Gas Stopping Cell at SHIPTRAP — Christian Droese1, Klaus Blaum2, Michael Block3,4, Premaditya Chhetri5, Sergey Eliseev2, Frank Herfurth4, •Mustapha Laatiaoui3, Felix Lautenschläger5, Enrique Minaya Ramirez2, Lutz Schweikhard1, and Peter Thirolf6 — 1Ernst-Moritz-Arndt-Universität Greifswald — 2Max- Planck-Institut für Kernphysik Heidelberg — 3Helmholtz-Institut Mainz — 4GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 5Technische Universität Darmstadt — 6Ludwig-Maximilians- Universität München
The Penning-trap mass spectrometer SHIPTRAP is employed for high-precision mass measurements of exotic nuclides, in particular in the region above fermium. In recent experiments, the masses of 252−254No and 255,256Lr were measured directly for the first time in a Penning trap. These achievements paved the way for the development of a new-generation gas-stopping cell aiming for mass measurements in the superheavy element region. As the expected production rates are below one per hour, the stopping and extraction of the evaporation residues becomes a bottleneck for the entire setup’s performance. With the new gas cell operated at cryogenic temperatures an extraction efficiency of 74(3)% was obtained, an increase by a factor of 2.5 compared to the old setup. In this talk, results from the off-line commissioning of the new cell will be presented.