Magnetic moment and electric quadrupole moment of the [formula omitted]N ground state

• Published in: Physics letters. B 1999-04, Vol.451 (1), p.11-18
• Main Authors: Ogawa, H., Asahi, K., Sakai, K., Yoshimi, A., Tsuda, M., Uchiyama, Y., Suzuki, T., Suzuki, K., Kurokawa, N., Adachi, M., Izumi, H., Ueno, H., Shimoda, T., Tanimoto, S., Takahashi, N., Schmidt-Ott, W.-D., Schäfer, M., Fukuda, S., Yoshida, A., Notani, M., Kubo, T., Okuno, H., Sato, H., Aoi, N., Yoneda, K., Iwasaki, H., Fukuda, N., Fukunishi, N., Ishihara, M., Miyatake, H.
• Format: Article
• Language: English
• Subjects: [formula omitted]N ground state; Effective charge; Electric quadrupole moment; Magnetic moment; Neutron-rich nuclei; Projectile fragmentation; Shell model; Spin polarization; β-NMR
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(99)00219-1

The magnetic moment and electric quadrupole moment of a neutron-rich nucleus 18 N have been determined by the β-NMR method, taking advantage of the fragment spin polarization induced in the intermediate-energy projectile fragmentation reaction. To assure the existence of a sufficient polarization prior to the resonance search, a scheme of polarization measurement by means of an adiabatic field rotation has been developed and successfully incorporated in the β-NMR experiment. From the observed resonance in a Pt stopper the magnetic moment for the 18 N ground state has been determined to be | μ|=0.3279±0.0013 μ 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 μ and Q are compared with shell model calculations.