Nuclear ground-state spins and magnetic moments of {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg
- Institut fuer Physik, Universitaet Mainz, D-55099 Mainz (Germany)
- Instituut voor Kern-en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven (Belgium)
- Germany
- Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven (Belgium)
The ground-state spins and magnetic moments of neutron-rich {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg were measured for the first time with laser and {beta}-NMR spectroscopy at ISOLDE/CERN. The hyperfine structure of {sup 27}Mg--observed in fluorescence--confirms previous assignments of the spin I=1/2 and reveals the magnetic moment {mu}{sub I}({sup 27}Mg)=-0.4107(15){mu}{sub N}. The hyperfine structure and nuclear magnetic resonance of optically polarized {sup 29}Mg--observed in the asymmetry of its {beta} decay after implantation in a cubic crystal--give I=3/2 and {mu}{sub I}({sup 29}Mg)=+0.9780(6){mu}{sub N}. For {sup 31}Mg they yield together I=1/2 and {mu}{sub I}({sup 31}Mg)=-0.88355(15){mu}{sub N}, where the negative magnetic moment provides evidence for a positive parity. The results for {sup 27}Mg and {sup 29}Mg agree well with shell-model calculations confined only to the sd model space, whereas the ground state of {sup 31}Mg involves large contributions from neutrons in the pf shell, which places this nucleus inside the ''island of inversion.''.
- OSTI ID:
- 21189825
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 3; Other Information: DOI: 10.1103/PhysRevC.77.034307; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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