Measurement of the Spin and Magnetic Moment of Mg-31: Evidence for a Strongly Deformed Intruder Ground State - INSPIRE

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Measurement of the Spin and Magnetic Moment of Mg-31: Evidence for a Strongly Deformed Intruder Ground State

G. Neyens
(
- Leuven U.
)
,
M. Kowalska
(
- Mainz U., Inst. Phys.
)
,
D. Yordanov
(
- Leuven U.
)
,
K. Blaum
(
- CERN
)
,
P. Himpe
(
- Leuven U.
)

Jan 21, 2005

4 pages

Published in:

Phys.Rev.Lett. 94 (2005) 022501

DOI:

10.1103/PhysRevLett.94.022501

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Abstract: (APS)

Unambiguous values of the spin and magnetic moment of Mg31 are obtained by combining the results of a hyperfine-structure measurement and a β-NMR measurement, both performed with an optically polarized ion beam. With a measured nuclear g factor and spin I=1/2, the magnetic moment μ(Mg31)=−0.88355(15)μN is deduced. A revised level scheme of Mg31 (Z=12, N=19) with ground state spin/parity Iπ=1/2+ is presented, revealing the coexistence of 1p-1h and 2p-2h intruder states below 500 keV. Advanced shell-model calculations and the Nilsson model suggest that the Iπ=1/2+ ground state is a strongly prolate deformed intruder state. This result plays a key role for the understanding of nuclear structure changes due to the disappearance of the N=20 shell gap in neutron-rich nuclei.

27.30.+t
32.10.Fn
23.20.-g
21.10.-k

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