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The $g$ factors of several low-lying excited states of the neutron-rich $^{101}\mathrm{Zr}$ and $^{103,105}\mathrm{Mo}$ nuclei have been measured for the first time. The isotopes were produced by the spontaneous fission of a $^{252}\mathrm{Cf}$ source, which was sandwiched between two magnetized iron foils and placed at the center of the Gammasphere spectrometer. The $g$ factors of excited states of fission fragments were inferred from Larmor precessions deduced from the measurement of time-integrated perturbed angular correlation functions. The magnitude and sign of the quantity $({g}_{K}\ensuremath{-}{g}_{R})/{Q}_{0}$ were determined from the mixing ratios measured for the 3/2[411] and 5/2[532] rotational bands in $^{101}\mathrm{Zr}$ and $^{103,105}\mathrm{Mo}$. The combination of this quantity with the measured $g$ factors permitted the separation of the particle-rotor parameters ${g}_{K}$ and ${g}_{R}$ for each band. The comparison of the extracted ${g}_{K}$ factors to Nilsson model predictions confirms current band assignments, and this agreement is consistent with an axially symmetric picture of these nuclei at low spins. The possible effect of triaxial deformation on the measured magnetic moments was investigated in the rigid triaxial rotor-plus-particle framework. The calculations suggest that triaxial deformation plays a stronger role in the Mo than in the Zr isotopes, but that triaxiality is likely to be dynamic. The extracted ${g}_{R}$ factors are consistently smaller than the $Z/A$ limit, in agreement with observations in neighboring even-even nuclei.

The magnetic moments of I$^\pi = 2^+_1$ states in even–even A $\sim$ 100 fission fragments have been measured using the Gammasphere array, using the technique of time-integral perturbed angular correlations. The collective (core) g factors of several odd nuclei have also been determined. The data are interpreted within the context of the interacting boson model (IBA2).

The magnetic moments of I π =2 1 + states in even–even A ∼100 fission fragments have been measured using the Gammasphere array, using the technique of time-integral perturbed angular correlations. The data are interpreted within the context of the interacting boson model (IBA2) leading to the suggestion of a strong νh 11/2 component in the deformed 2 1 + states of this region.