O

We have conducted the measurements of the nuclear magnetic dipole and electric quadrupole moments for the ground-state of ²¹O by means of the technique of fragmentation-induced spin polarization combined with the β-ray-detected NMR method. This isotope is of immediate interest to both nuclear-structure and materials science studies. The ground-state nuclear moments will provide us with key information on the change in the nuclear structure in the neutron-rich oxygen isotopes. In particular, the nuclear moments of ²¹O are indispensable to investigate how nuclear structure changes occur in the neutron-rich oxygen isotopes, from ¹⁸O, the stable isotope, to ²³O, the neutron-rich isotope for which anomalous nuclear properties have been reported. In view of materials science, the obtained nuclear moments will enable us to use ²¹O as a magnetic/electric NMR probe to directly explore the function of oxygen in the oxygen-based systems for material characterization. In this regard, ²¹O has apparent advantages as compared to other oxygen isotopes for which the ground-state nuclear moments are known. The presentation will cover the experimental methods, the results in terms of the nuclear structure as well as the prospects of the β-NMR measurements of ²¹O for materials science studies.