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 Ramirez^1,2, D. Ackermann², K. Blaum^3,4, M. Block², C. Droese⁵, Ch. E. Düllmann^1,2,6, M. Eibach⁶, S. Eliseev³, E. Haettner^2,7, F. Herfurth², F.P. Hessberger², S. Hofmann², G. Marx⁵, D. Nesterenko⁸, Yu. Novikov⁸, W.R. Plass^2,7, D. Rodríguez⁹, C. Scheidenberger^2,7, L. Schweikhard⁵, P.G. Thirolf¹⁰, and C. Weber¹⁰ — ¹Helmholtz-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.