Electromagnetic Moments of nuclei in the P and sd cross-shell region

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The magnetic moment and electric quadrupole moment of a neutron-rich nucleus ^<18>N have been determined by the beta-NMR method, taking advantage of the fragment spin polarizationinduced in the intermediate-energy projectile fragmentation reaction. To assure the existence of a sufficient polarization prior to theresonance search, a scheme of polarization measurement by means of an adiabatic fleidrotation has been developed and successfully incorporated in the beta-NMR experiment. From the observed resonance in a Pt stopper the magnetic moment for the ^<18>N ground state has been determined to be |mu | = 0.3279 * 0.0013 mu_N. The ^<18>N fragments have also been implanted in a single crystal Mg stopper, and from the observed quadrupole frequency |eqQ/h| = 73.2 * 1.4 kHz, the electric quadrupole moment |Q| 12.3 * 1.2 mb has been deduced. The obtained mu and Q are compared with shell model calculations.