Ground-state nuclear-moment measurement of neutron-rich sulfur isotopes

Recently the erosion of $N=$28 shell gap has been suggested from several spectroscopic experimental data on neutron-rich nuclei. In particular, $^{\mathrm{43}}$S isotope is of much interest since shape coexistence is expected to occur which provides key information to understand the evolution of shell gaps far from the stability. The isomeric state of $^{\mathrm{43}}$S at 320 keV is suggested to have a shape close to sphericity with spin-parity of 7/2, but both the spin-parity and deformed parameter of the ground-state have not been determined directly. In order to investigate mechanisms leading to such an anomalous nuclear structure, we aim at measuring the ground-state nuclear-moment for $^{\mathrm{41,43}}$S. As the first step, the measurement of $\mu $ moment of $^{\mathrm{41}}$S was performed using the technique of $\beta $-NMR method at the RIPS facility at RIKEN. In the presentation, the result of this work will be reported.