With the technique of nuclear magnetic resonance on oriented nuclei, the magnetic hyperfine splitting of ${}_{}{}^{93}{}_{}{}^{}\mathrm{Mo}_{}^m{}_{}{}^{}\mathrm{Fe}$ has been investigated in external magnetic fields $B_0=1\mathrm{}\dots 7$ kG at temperature of ∼0.01 K. The zero-field splitting and the resonance shift with $B_0$ were measured $\left|\frac{g{\mu }_N{B}_{\mathrm{HF}}}{h}\mathrm{}\right|=183.84\left(1\mathrm{}\right)\mathrm{}$ MHz and $\left|\frac{g{\mu }_N}{h}\mathrm{}\right|=0.721\left(8\mathrm{}\right)\mathrm{}$ MHz/kG, yielding consistent values for the nuclear $g$ factor of 0.947(19) and 0.946(9), respectively. From the mean value $\mathrm{}\left|g\right|=0.946\mathrm{}\left(8\right)\mathrm{}$ the magnetic moment is derived as $\left|\mu \mathrm{}\right|=9.93\left(8\mathrm{}\right)\mathrm{}{\mu }_N$. This confirms the structure of the ${21/2}^{+}$ state as ${|{\left(\pi g_{{\frac{9}{2}}^{+}}\right)}_{{8^{+}}^2}\nu d_{{\frac{5}{2}}^{+}}〉}_{{\frac{21}{2}}^{+}}$ for which $\mu =10.00\mathrm{}\left(5\right)\mathrm{}{\mu }_N$ is expected taking into account experimentally known magnetic properties of neighboring nuclei. Our measurements show that the additivity relation for the magnetic moments holds well for this state, and that the results of a previous nuclear magnetic resonance on oriented nuclei measurement must be erroneous.

RADIOACTIVITY ${}_{}{}^{93}{}_{}{}^{}\mathrm{Mo}_{}^m{}_{}{}^{}$ [from ${}_{}{}^{93}{}_{}{}^{}\mathrm{Nb}(\alpha ,3np)$]; measured $I_{\gamma }$ ($\theta ,T,\nu$) of oriented states; NMR on oriented nuclei. Deduced $g$, $\mu$, relaxation times.

• Received 24 October 1980

DOI:https://doi.org/10.1103/PhysRevC.23.2252