[paper] Magnetic moment of 104Agm and the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance on oriented nuclei

Magnetic moment of 104Agm and the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance on oriented nuclei

V.V. Golovko et al.

doi: 10.1103/PhysRevC.81.054323

Nuclear magnetic resonance (NMR/ON) measurements with β- and γ-ray detection have been performed on oriented 104Agg,m nuclei with the NICOLE 3He-4He dilution refrigerator setup at ISOLDE/CERN. For 104Agg (Iπ=5+) the γ-NMR/ON resonance signal was found at ν=266.70(5) MHz. Combining this result with the known magnetic moment for this isotope, the magnetic hyperfine field of Ag impurities in an Fe host at low temperature (<1 K) is found to be |Bhf(AgFe)|=44.709(35) T. A detailed analysis of other relevant data available in the literature yields three more values for this hyperfine field. Averaging all four values yields a new and precise value for the hyperfine field of Ag in Fe; that is, |Bhf(AgFe)|=44.692(30) T. For 104Agm (Iπ=2+), the anisotropy of the β particles provided the NMR/ON resonance signal at ν=627.7(4) MHz. Using the new value for the hyperfine field of Ag in Fe, this frequency corresponds to the magnetic moment μ(104mAg)=+3.691(3) μN, which is significantly more precise than previous results. The magnetic moments of the even-A 102-110Ag isotopes are discussed in view of the competition between the (πg9/2)7/2+-3(νd5/2νg7/2)5/2+ and the (πg9/2)9/2+-3(νd5/2νg7/2)5/2+ configurations. The magnetic moments of the ground and isomeric states of 104Ag can be explained by an almost complete mixing of these two configurations.

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