Feb 6 – 8, 2006
Europe/Zurich timezone

Moments and spins of neutron rich Mg isotopes: towards 33Mg

Feb 7, 2006, 11:55 AM
Council Chamber, 503/1-001 (CERN)

Council Chamber, 503/1-001


CH-1211 Geneva 23


Deyan D. Yordanov (IKS)


Our research on the neutron rich side of the Mg chain will be presented, which is of interest in the frame of understanding nuclear structure in the region of the “Island of inversion”. Nuclei around 32Mg exhibit properties in disagreement with the standard shell model. Advanced modeling of the region requires experimental data, crucial parts of which are the nuclear moments data. The research taking place the last years at the collinear laser spectroscopy setup COLLAPS at ISOLDE, CERN has significantly contributed in this aspect. The obtained nuclear moments and hyperfine structure of 27, 29, 31Mg will be presented, illustrating the actuality of the technique of nuclear magnetic resonance in combination with laser spectroscopy. Interpretation in the frame of the shell model will be given, and in the case of 31Mg the results will be linked with a resent β – decay study and discussed in the terms of particle – hole excitations over N=20 shell gap. Our recent measurement of the hyperfine structure of 33Mg will be presented for a very first time, revealing possibilities for tentative ground state spin – magnetic moment assignments. The necessity of combining an NMR measurement with a hyperfine structure measurement in order to unambiguously determine the ground state spin will be illustrated. The isotope shifts between 24, 25, 26, 27Mg, revealing the changes in mean square charge radii, have been measured as well. The point of extending the sequence to get access to changes in deformation towards N=20, particularly for isotopes with spin 0 or 1/2 – unreachable with other techniques, will be discussed as well.

Primary author

Presentation materials