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Probing the N=14 subshell closure: g factor of the Mg26(21+) state

The first-excited state g factor of 26Mg has been measured relative to the g factor of the Mg24(21+) state using the high-velocity transient-field technique, giving g=+0.86±0.10. This new measurement is in strong disagreement with the currently adopted value, but in agreement with the sd-shell model...

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Bibliographic Details
Published in:Physics letters. B 2018-04, Vol.779, p.445-451
Main Authors: McCormick, B.P., Stuchbery, A.E., Kibédi, T., Lane, G.J., Reed, M.W., Eriksen, T.K., Hota, S.S., Lee, B.Q., Palalani, N.
Format: Article
Language:English
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Summary:The first-excited state g factor of 26Mg has been measured relative to the g factor of the Mg24(21+) state using the high-velocity transient-field technique, giving g=+0.86±0.10. This new measurement is in strong disagreement with the currently adopted value, but in agreement with the sd-shell model using the USDB interaction. The newly measured g factor, along with E(21+) and B(E2) systematics, signal the closure of the νd5/2 subshell at N=14. The possibility that precise g-factor measurements may indicate the onset of neutron pf admixtures in first-excited state even–even magnesium isotopes below 32Mg is discussed and the importance of precise excited-state g-factor measurements on sd shell nuclei with N≠Z to test shell-model wavefunctions is noted.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2018.02.032