We have remeasured the ground state $g$ factor of ${}^9\mathrm{C}$ using the technique of nuclear magnetic resonance on beta-emitting nuclei (β-NMR) on spin-polarized ${}^9\mathrm{C}$ nuclei produced by the fragmentation of a ${}^{20}\mathrm{Ne}$ beam at 80 MeV/nucleon in a Nb target. Our new value of 1.396(3)${\mu }_N$ is consistent with the previously measured value of the ground state magnetic moment of this nuclide. The results of shell model calculations employing isospin-nonconserving (INC) terms in the nuclear Hamiltonian are shown to better reproduce the quenched magnetic dipole moment of ${}^9\mathrm{C}$ and the previously described anomalous isoscalar spin expectation value 〈σ〉 for the ${}^9{\mathrm{L}\mathrm{i}-}^9\mathrm{C}$ mirror system.

• Received 26 August 1997

DOI:https://doi.org/10.1103/PhysRevC.57.R2790