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.