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HK: Fachverband Physik der Hadronen und Kerne
HK 67: Struktur und Dynamik von Kernen XI
HK 67.2: Talk
Friday, March 25, 2011, 14:30–14:45, A-1
Charge radii of magnesium isotopes: a structural study over the sd shell — •Kim Kreim — Max-Planck-Institut für Kernphysik, Heidelberg
The island of inversion is commonly regarded as an island of deformation. Yet, the transition to a deformed configuration in the neutron-rich and neutron-deficient isotopes of magnesium is not well understood. This problem cannot be addressed by quadrupole-moment measurements due to nuclear spins 0 or 1/2 of the key isotopes. Experimental evidence from reaction studies and ground-state properties of 31,33Mg are consistent with considerable prolate deformation in the neutron-rich isotopes. The structural changes in the neutron-deficient isotopes may originate from clustering, in a way similar to neon. However, in order to obtain a consistent picture of the evolution of the nuclear shape along the magnesium chain one has to measure a quantity accessible for all isotopes (odd and even) with the same experimental technique. Accordingly, a measurement of the rms charge radii of 21−32Mg will be presented for the first time with emphasis on the new method for isotope-shift measurements based on combining fluorescence detection with β-detection. (Supported by BMBF)