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Hannover 2013 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 6: Ion Storage Rings and Precision Mass Spectrometry

MS 6.4: Talk

Wednesday, March 20, 2013, 12:00–12:15, F 442

Exploring the nuclear structure above fermium with SHIPTRAP — •E. Minaya Ramirez1,2, D. Ackermann2, K. Blaum3,4, M. Block2, C. Droese5, Ch. E. Düllmann1,2,6, M. Eibach6, S. Eliseev3, E. Haettner2,7, F. Herfurth2, F.P. Hessberger2, S. Hofmann2, G. Marx5, D. Nesterenko8, Yu. Novikov8, W.R. Plass2,7, D. Rodríguez9, C. Scheidenberger2,7, L. Schweikhard5, P.G. Thirolf10, and C. Weber101Helmholtz-Institut Mainz — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Max-Planck-Institut für Kernphysik, Heidelberg — 4Ruprecht-Karls-Universität Heidelberg — 5Ernst-Moritz-Arndt-Universität, Greifswald — 6Johannes Gutenberg-Universität Mainz — 7Justus-Liebig-Universität Gießen — 8PNPI RAS Gatchina, St. Petersburg — 9Universidad de Granada — 10Ludwig-Maximilians-Universität München

Penning-trap mass spectrometry of radionuclides provides direct mass measurements with an accuracy of a few keV. The mass gives access to the nuclear binding energy, a crucial parameter to investigate the nuclear shell structure. Furthermore, the combination of α-decay spectroscopy and directly measured masses above fermium (Z = 100) allows determining the masses of higher-Z nuclides to guide the exploration of the island of stability of superheavy elements. Recently, the masses of the nuclides 252−255No and 255,256Lr have been measured with high accuracy using the Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt. The accurate experimental binding energies allow mapping of the shell effects at N = 152. In order to measure the masses of nuclides with production cross sections even lower than 256Lr, new developments are envisaged to improve the efficiency of the SHIPTRAP setup. Future measurements and recent developments will be presented.

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