Nuclear ground-state spins and magnetic moments of {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg

Kowalska, M; Neugart, R; Yordanov, D T; Himpe, P; Mallion, S; Neyens, G; Vermeulen, N; Blaum, K; GSI, D-64291 Darmstadt; Lievens, P

doi:10.1103/PHYSREVC.77.034307

Title: Nuclear ground-state spins and magnetic moments of {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg

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Abstract

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.''.

Authors:

Kowalska, M; Neugart, R ^[1]; Yordanov, D T; Himpe, P; Mallion, S; Neyens, G; Vermeulen, N ^[2]; Blaum, K ^[1]; GSI, D-64291 Darmstadt ^[3]; Lievens, P ^[4]

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)

Publication Date:: Sat Mar 15 00:00:00 EDT 2008

OSTI Identifier:: 21189825

Resource Type:: Journal Article

Journal Name:: Physical Review. C, Nuclear Physics

Additional Journal Information:: Journal Volume: 77; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.77.034307; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASYMMETRY; BETA DECAY; CERN; FLUORESCENCE; GROUND STATES; HYPERFINE STRUCTURE; LASER RADIATION; MAGNESIUM 27; MAGNESIUM 29; MAGNESIUM 31; MAGNETIC MOMENTS; NEUTRON-RICH ISOTOPES; NEUTRONS; NUCLEAR MAGNETIC RESONANCE; PARITY; SHELL MODELS; SPECTROSCOPY; SPIN

Citation Formats


                    Kowalska, M, Neugart, R, Yordanov, D T, Himpe, P, Mallion, S, Neyens, G, Vermeulen, N, Blaum, K, GSI, D-64291 Darmstadt, and Lievens, P. Nuclear ground-state spins and magnetic moments of {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg.  United States: N. p., 2008. 
        Web.  doi:10.1103/PHYSREVC.77.034307.

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                    Kowalska, M, Neugart, R, Yordanov, D T, Himpe, P, Mallion, S, Neyens, G, Vermeulen, N, Blaum, K, GSI, D-64291 Darmstadt, & Lievens, P. Nuclear ground-state spins and magnetic moments of {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg.  United States.  https://doi.org/10.1103/PHYSREVC.77.034307

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                    Kowalska, M, Neugart, R, Yordanov, D T, Himpe, P, Mallion, S, Neyens, G, Vermeulen, N, Blaum, K, GSI, D-64291 Darmstadt, and Lievens, P. 2008.  
        "Nuclear ground-state spins and magnetic moments of {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg".  United States.  https://doi.org/10.1103/PHYSREVC.77.034307.

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@article{osti_21189825,

  title        = {Nuclear ground-state spins and magnetic moments of {sup 27}Mg, {sup 29}Mg, and {sup 31}Mg},

  author       = {Kowalska, M and Neugart, R and Yordanov, D T and Himpe, P and Mallion, S and Neyens, G and Vermeulen, N and Blaum, K and GSI, D-64291 Darmstadt and Lievens, P},

  abstractNote = {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.''.},

  doi          = {10.1103/PHYSREVC.77.034307},

  url          = {https://www.osti.gov/biblio/21189825},
  journal      = {Physical Review. C, Nuclear Physics},

  issn         = {0556-2813},

  number       = 3,

  volume       = 77,

  place        = {United States},

  year         = {Sat Mar 15 00:00:00 EDT 2008},

  month        = {Sat Mar 15 00:00:00 EDT 2008}

}

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