Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Struktur und Dynamik von Kernen VI

HK 29.6: Talk

Tuesday, March 16, 2010, 17:45–18:00, HG VII

Nuclear charge radii of magnesium isotopes by laser spectroscopy with combined fluorescence and beta-decay detection — •J. Krämer¹, D. T Yordanov², M. L. Bissell³, K. Blaum², M. Depuydt³, Ch. Geppert^1,4, M. Hammen¹, K. Kreim², A. Krieger¹, M. Kowalska⁵, R. Neugart¹, G. Neyens³, W. Nörtershäuser^1,4, R. M. Sanchez-Alarcon⁴, B. Sieber¹, and P. Vingerhoets³ — ¹Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Mainz, Germany — ²Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ³Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, Belgium — ⁴GSI Helmholtzzentrum für Schwerionenforschung, Germany — ⁵CERN, Physics Department, Switzerland

The ground states of magnesium isotopes exhibit intruder configurations with the pf shell being populated before the sd shell is complete. In the transition to this "island of inversion" the nuclear charge radii extracted from isotope-shift measurements should clearly indicate a structural change, expected to happen in the step from ³⁰Mg to ³¹Mg. The magnesium isotope shifts were measured by collinear laser spectroscopy combined with either β-decay asymmetry detection after optical pumping or fluorescence detection. Isotope shift extraction became possible only after a thorough understanding and simulation of the observed line shapes of the β-asymmetry spectra and could be demonstrated for the first time. The ²⁴⁻³²Mg charge radii will be presented and comparisons with the trends predicted by models will be made.