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MS: Fachverband Massenspektrometrie

MS 3: Präzisionsmassenspektrometrie, Ionenfallen, FT-IZR-MS, Moleküle, Cluster III

MS 3.4: Vortrag

Montag, 2. März 2009, 17:00–17:15, VMP 8 R05

The influence of magnetic field fluctuations on the mass uncertainty of SHIPTRAP — •Christian Droese³, Dieter Ackkermann², Michael Block¹, Michael Dworschak¹, Sergey Eliseev², E. Haettner⁴, Frank Herfurth¹, Fritz-Peter Hessberger¹, Sigurd Hofmann¹, Heinz-Jürgen Kluge^1,5, Gerrit Marx³, M. Mazzocco⁶, Yuri Novikov^1,7, W. Plass⁴, Saidur Rahaman⁸, Daniel Rodriguez⁹, C. Scheidenberger^1,4, Lutz Schweikhard³, Peter Thirolf¹⁰, Gleb Vobrobyew^1,7, Christine Weber⁸, Jens Ketelaer¹¹ und Jochen Ketter¹¹ — ¹GSI Helmholtzzentrum für Schwerionenforschung mbH, 64291 Darmstadt, Germany — ²Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — ³Institut für Physik, 17487 Greifswald, Germany — ⁴II. Physikalisches Institut,Justus-Liebig-Universität, 35392 Gießen, Germany — ⁵Ruprecht-Karls-Universität, 69120 Heidelberg, Germany — ⁶University of Padova, 35122 Padova, Italy — ⁷Petersburg Nuclear Physics Institute, 188300 Gatchina, St. Petersburg, Russia — ⁸Department of Physics, University of Jyväskyä, 40014 Jyväskylä, Finland — ⁹Universidad de Huelva, 21071 Huelva, Spain — ¹⁰Fakultät für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany — ¹¹Institut für Physik, Johannes-Gutenberg-Universität, 55099 Mainz, Germany

Precise atomic mass measurements are essential for obtaining conclusive answers in several disciplines in physics. Particularly important are the values of masses of nuclides close to the limits of nuclear existence, commonly referred to as exotic nuclides. The masses contribute, for example, to a better understanding of astrophysical nucleosynthesis. SHIPTRAP is a high-precission mass measurement facility for heavy and superheavy ions produced in fusion-evaporation reactions at the velocity filter SHIP at GSI. The system consists of a buffer-gas cell to thermalise the incoming ions, an extraction system to separate the ions from the buffer gas, an RFQ buncher to cool and accumulate the ions and a tandem Penning-trap system for isobaric purification and high-precision mass measurements. With this setup absolut mass measurements with an uncertainty of about 10⁻⁸ are possible. For the detection of superheavy ions with low production rates in a penning trap system a magnetic field with lowest possible fluctuations is essential to minimize the systematical error of the results. These fluctuations can be effectively reduced by stabilizing the temperature and the pressure in the superconducting magnet. The implementation of such a system and its impact on the uncertainty for long term measurements will be presented.