### 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) |
---|---|

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 |

### Fingerprint

### Keywords

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

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*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

**Nuclear ground-state spin and magnetic moment of 21Mg.** / Krämer, J.; Blaum, K.; De Rydt, M.; Flanagan, K. T.; Geppert, Ch; Kowalska, M.; Lievens, P.; Neugart, R.; Neyens, G.; Nörtershäuser, W.; Stroke, H. H.; Vingerhoets, P.; Yordanov, D. T.

Research output: Contribution to journal › Article

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*, vol. 678, no. 5, pp. 465-469. https://doi.org/10.1016/j.physletb.2009.06.063

}

TY - JOUR

T1 - Nuclear ground-state spin and magnetic moment of 21Mg

AU - Krämer, J.

AU - Blaum, K.

AU - De Rydt, M.

AU - Flanagan, K. T.

AU - Geppert, Ch

AU - Kowalska, M.

AU - Lievens, P.

AU - Neugart, R.

AU - Neyens, G.

AU - Nörtershäuser, W.

AU - Stroke, H. H.

AU - Vingerhoets, P.

AU - Yordanov, D. T.

PY - 2009/8/3

Y1 - 2009/8/3

N2 - We present the results of combined laser spectroscopy and nuclear magnetic resonance studies of 21Mg. The nuclear ground-state spin was measured to be I = 5 / 2 with a magnetic moment of μ = - 0.983 (7) μN. The isoscalar magnetic moment of the mirror pair (21F, 21Mg) 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.

AB - We present the results of combined laser spectroscopy and nuclear magnetic resonance studies of 21Mg. The nuclear ground-state spin was measured to be I = 5 / 2 with a magnetic moment of μ = - 0.983 (7) μN. The isoscalar magnetic moment of the mirror pair (21F, 21Mg) 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.

KW - Hyperfine structure

KW - Laser spectroscopy

KW - NMR

KW - Nuclear magnetic moment

UR - http://www.scopus.com/inward/record.url?scp=67651123197&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67651123197&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2009.06.063

DO - 10.1016/j.physletb.2009.06.063

M3 - Article

VL - 678

SP - 465

EP - 469

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

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

SN - 0370-2693

IS - 5

ER -