Dresden 2011 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Precision Mass Spectrometry and Fundamental Applications
MS 5.5: Vortrag
Mittwoch, 16. März 2011, 11:45–12:00, GÖR 229
Investigation of the accuracy limit at the Penning trap mass spectrometer TRIGA-TRAP — •Christian Smorra1,2, Thomas Beyer1,3, Klaus Blaum1,3, Jens Ketelaer3, Szilard Nagy3,4, Dennis Neidherr5, Dennis Renisch2,3, and the Triga-Trap Collaboration2,3,4 — 1Ruprecht-Karls-Universität, 69117 Heidelberg — 2Johannes Gutenberg-Universität, 55128 Mainz — 3Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt — 5Helmholtz-Institut Mainz, 55128 Mainz
Penning-trap mass spectrometry is a way to determine nuclear binding energies very accurately by measuring the cyclotron frequency of a trapped ion. The cyclotron frequency is then compared to a reference measurement of an ion with well-known mass. The double Penning-trap mass spectrometer TRIGA-TRAP, which is part of the TRIGA-SPEC facility, was installed at the research reactor TRIGA-Mainz. In order to investigate the uncertainty limit of the mass measurements, systematic studies have been performed using carbon clusters from 12C10+ to 12C23+, thus covering the whole mass range of the radionuclides available at the TRIGA reactor. Effects like magnetic field fluctuations and mass dependent frequency shifts have been studied and their amplitudes quantified. The well-known mass of 197Au has been measured and used as a cosistency check at the level of 2.7·10−8. The present status as well as the results of first mass measurements on stable rare-earth nuclides will be presented.