Speaker
Deyan D. Yordanov
(IKS)
Description
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.
Author
Deyan D. Yordanov
(IKS)
