Magnetic moment of the ground state of 17C

Based on the β-NMR method on spin-polarized radioactive-isotope beams, magnetic moments of the ground state of light unstable nuclei have been measured. In this paper, we report on a recent result obtained in the g-factor measurement for the 17C ground state. In the case of 17C, the g-factor is extremely sensitive to whether the spin-parity is 1/2+ or 3/2+, which are possible candidates for the ground state: the corresponding Schmidt values, gs1/2=-3.83 and gd3/2=+0.76, differ largely from each other. Similar observation is gained in more realistic shell model calculations in which g1/2+=-3.13 and g3/2+=-0.58 are predicted. Owing to these large difference, the spin-parity can be reliably assigned from the measurement of g-factor. From the obtained NMR spectrum, |g(17C)|=0.5054(24) was determined. This result clearly indicates that the spin-parity for the ground state of 17C is Jπ=3/2+. (author)