Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Instrumentation
HK 64.3: Talk
Friday, March 23, 2012, 14:45–15:00, P 2
Commissioning of the Cryogenic Buffer-Gas Stopping Cell at SHIPTRAP* — •Christian Droese1, Klaus Blaum2, Michael Block3, Sergey Eliseev2, Frank Herfurth3, Mustapha Laatiaoui4,5, Felix Lautenschläger4, Enrique Minaya Ramirez6, Lutz Schweikhard1, and Peter Thirolf5 — 1Ernst-Moritz-Arndt-Universität Greifswald — 2Max-Planck-Institut für Kernphysik Heidelberg — 3GSI Helmholtzzentrum für Schwerionenforschung Darmstadt — 4Technische Universität Darmstadt — 5Ludwig-Maximilians-Universität München — 6Helmholtz-Institut Mainz
The Penning-trap spectrometer SHIPTRAP (M. Block et al., Eur. Phys. J. D 45 (2007) 39) is employed to perform high-precision mass measurements of exotic nuclides, in particular above fermium. In recent experiments the masses of 252-254No and 255,256Lr were measured directly for the first time in a Penning trap (M. Block et al., Nature 463 (2010) 785). For mass measurements of heavier elements, it is crucial to further increase the overall efficiency of the setup which is mainly limited by the stopping efficiency of the fusion evaporation products in the SHIPTRAP gas cell. Therefore, a second generation gas cell with increased stopping volume was designed. In addition, the operation at cryogenic temperatures leads to a larger gas density at a lower pressure and an improved cleanliness of the helium buffer gas. With the new gas cell an increase of the overall efficiency by up to a factor of 5 is expected. The first results of the commissioning will be presented. *Supported by BMBF (06ML9148) and GSI (LMTHIR1012).