### Abstract

We present the results of combined laser spectroscopy and nuclear magnetic resonance studies of ^{21}Mg. The nuclear ground-state spin was measured to be I = 5 / 2 with a magnetic moment of μ = - 0.983 (7) μ_{N}. The isoscalar magnetic moment of the mirror pair (^{21}F, ^{21}Mg) is evaluated and compared to the extreme single-particle prediction and to nuclear shell-model calculations. We determine an isoscalar spin expectation value of 〈 σ 〉 = 1.15 (2), which is significantly greater than the empirical limit of unity given by the Schmidt values of the magnetic moments. Shell-model calculations taking into account isospin non-conserving effects, are in agreement with our experimental results.

Original language | English (US) |
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Pages (from-to) | 465-469 |

Number of pages | 5 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 678 |

Issue number | 5 |

DOIs | |

State | Published - Aug 3 2009 |

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### Keywords

- Hyperfine structure
- Laser spectroscopy
- NMR
- Nuclear magnetic moment

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

^{21}Mg.

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*678*(5), 465-469. https://doi.org/10.1016/j.physletb.2009.06.063