Nuclear magnetic resonance (NMR/ON) measurements with $\beta$- and $\gamma$-ray detection have been performed on oriented ${}^{104}\mathrm{Ag}$${}^{\mathit{g},\mathit{m}}$ nuclei with the NICOLE ${}^3\mathrm{He}$-${}^4\mathrm{He}$ dilution refrigerator setup at ISOLDE/CERN. For ${}^{104}\mathrm{Ag}$${}^{\mathit{g}}$ ($I^{\pi }=5^{+}$) the $\gamma$-NMR/ON resonance signal was found at $\nu =266.70(5)$ 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 $|{\mathcal{B}}_{\mathrm{hf}}(\mathrm{Ag}\mathit{Fe})|=44.709(35)$ 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, $|{\mathcal{B}}_{\mathrm{hf}}(\mathrm{Ag}\mathit{Fe})|=44.692(30)$ T. For ${}^{104}\mathrm{Ag}$${}^{\mathit{m}}$ ($I^{\pi }=2^{+}$), the anisotropy of the $\beta$ particles provided the NMR/ON resonance signal at $\nu =627.7(4)$ MHz. Using the new value for the hyperfine field of Ag in Fe, this frequency corresponds to the magnetic moment $\mu ({}^{104m}\mathrm{Ag})=+3.691(3)$ ${\mu }_{\mathrm{N}}$, which is significantly more precise than previous results. The magnetic moments of the even-A ${}^{102-110}\mathrm{Ag}$ isotopes are discussed in view of the competition between the $(\pi g_{9/2}){}_{7/2^{+}}^{-3}(\nu d_{5/2}\nu g_{7/2}){}_{5/2^{+}}$ and the $(\pi g_{9/2}){}_{9/2^{+}}^{-3}(\nu d_{5/2}\nu g_{7/2}){}_{5/2^{+}}$ configurations. The magnetic moments of the ground and isomeric states of ${}^{104}\mathrm{Ag}$ can be explained by an almost complete mixing of these two configurations.

• Received 22 January 2010

DOI:https://doi.org/10.1103/PhysRevC.81.054323