Resolve the nature of the $^{119m}$Ag $g$-factor discontinuity

Establish whether the abrupt jump in the extracted nuclear $g$-factor for the spin-$7/2$ state at $N=72$ is caused by a real nuclear-structure effect or by an analysis artifact in the reported hyperfine $A$-factors, using a remeasurement of $^{119m}$Ag.

Background

The extracted gg-factors and BsB_s values show an unexpected jump at 119m^{119m}Ag. Because the authors do not regard the present data as sufficient to establish whether the jump is physical, they refrain from assigning a nuclear-structure interpretation or from claiming that their extracted moment is more accurate than the previously reported value.

The stated resolution is new high-precision spectroscopy or a remeasurement of the isotope. This problem is distinct from routine improvement of precision because it concerns the unresolved origin of the observed discontinuity itself.

References

It is unclear whether this abrupt jump in the nuclear $g$-factor for the spin-7/2 state at $N=72$ corresponds to a real nuclear-structure effect, or whether it originates from an analysis artifact on the reported $A$-factors. We do not attempt to provide a physics interpretation of this observation in this work, and thus we do not claim that the presently extracted magnetic dipole moment should be seen as more accurate or reliable than the value reported in Ref.. We call for a re-measurement of this isotope to clarify the origin of this observation.

— Nuclear moments, charge radii, and magnetization distribution parameters of Ag isotopes from laser spectroscopy and \textit{ab initio} electronic-structure calculations  (2609.40130 - Skripnikov et al., 30 Sep 2026) in Section 2, subsection “Nuclear magnetic dipole moments of radioactive isotopes”