Eur. Phys. J. Special Topics 150, 149-153 (2007)
https://doi.org/10.1140/epjst/e2007-00291-7

The “island of inversion" from a nuclear moments perspective and the g factor of ³⁵Si

¹ Katholieke Universiteit Leuven, I.K.S., Celestijnenlaan 200 D, 3001 Leuven, Belgium
² Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
³ CEA/DIF/DPTA/PN, BP. 12, 91680 Bruyères-le-Châtel, France
⁴ GANIL, BP. 55027, 14076 Caen Cedex 5, France

Received: 31 January 2007
Published online: 8 December 2007

Abstract

This paper reviews recent results from electromagnetic moment measurements on isotopes in the island of inversion around N=20. The obtained moments on neutron rich Na, Mg, Al and Si isotopes allow to draw conclusions on the amount of intruder components in their ground state wave function, demonstrating a gradual transition from the normal sd-shell region into the island of inversion, starting at N=18 for Na, N=19 for Mg and N=20 for Al isotopes. A measurement of the ground state g factor of ³⁵Si (N=21), using a polarized fragment beam at GANIL, is discussed in more detail. The magnetic moment μ(³⁵Si, I^π= 7/2^-) = (-)1.638(4) μ_N is consistent with a normal ground state structure, dominated by a νf_7/2 neutron.