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MS: Fachverband Massenspektrometrie

MS 2: Precision Mass Spectrometry 2

MS 2.6: Vortrag

Montag, 23. März 2015, 16:00–16:15, PH/HS2

Performance of the Cryogenic Buffer-Gas Stopping Cell at SHIPTRAP — Christian Droese¹, Klaus Blaum², Michael Block^3,4, 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.