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Title: Measurement of the spin and magnetic moment of Mg-31: Evidence for a strongly deformed intruder ground state
Authors: Neyens, Gerda ×
Kowalska, M
Yordanov, Deyan
Blaum, K
Himpe, Pieter
Lievens, Peter
Mallion, Stephen
Neugart, R
Vermeulen, Nele
Utsuno, Y
Otsuka, T #
Issue Date: Jan-2005
Publisher: American physical soc
Series Title: Physical Review Letters vol:94 issue:2 pages:1-4
Article number: 022501
Abstract: Unambiguous values of the spin and magnetic moment of Mg-31 are obtained by combining the results of a hyperfine-structure measurement and a beta-NMR measurement, both performed with an optically polarized ion beam. With a measured nuclear g factor and spin I=1/2, the magnetic moment mu(Mg-31)=-0.88355(15)mu(N) is deduced. A revised level scheme of Mg-31 (Z=12, N=19) with ground state spin/parity I-pi=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 I-pi=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.
URI: 
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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