Dresden 2011 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 3: Poster
MS 3.4: Poster
Montag, 14. März 2011, 16:00–18:00, P1
New anchor points of the mass surface in the rare-earth region provided by TRIGA-TRAP — •J Ketelaer1, T Beyer1,2, K Blaum1,2, M Eibach2,3, Sz Nagy1,4, D Neidherr5, D Renisch1,3, C Smorra2,3, and the Triga-Trap collaboration1,3,4 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 2Ruprecht-Karls-Universität, 69117 Heidelberg — 3Johannes Gutenberg-Universität, 55128 Mainz — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt — 5Helmholtz-Institut Mainz, 55128 Mainz
Nuclear structure effects, such as shell closures at magic nuclei as well as deformation, express themselves through certain characteristic shapes of the mass surface, which are usually studied using single and double differences of binding energies. Thus, precise and accurate experimental mass values, as measured, e.g., at the Penning-trap mass spectrometer TRIGA-TRAP, are highly required. The present recommended values of stable nuclides in the rare-earth region from the Atomic-Mass Evaluation (AME) 2003 are dominated by (n,γ) studies and only very few nuclides are part of a mass doublet. Recently, the masses of 15 stable isotopes of the elements europium, gadolinium, lutetium, and hafnium have been measured directly at TRIGA-TRAP using carbon cluster ions as references. Thus, these nuclides are now linked to the atomic-mass standard 12C serving as new anchor points of the mass surface. Furthermore, for some of the nuclides under investigation deviations of the mass of 3-4 standard deviations from the latest AME values have been found. The results of the mass measurements and the comparison to the AME 2003 data will be presented.