Magnetic moment and electric quadrupole moment of the 18N ground state

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Abstract

The magnetic moment and electric quadrupole moment of a neutron-rich nucleus 18N 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 18N ground state has been determined to be |μ|=0.3279±0.0013μN. The 18N 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.

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Acknowledgements

The authors wish to thank the staffs of the RIKEN Ring Cyclotron for their support during the experiment. They would like to express special thanks to Dr. A. Saiki for useful help and advice with crystallographic analysis of the Mg samples. Two of the authors, N.A. and K.Y., are grateful to Research Fellowships of the Japan Society of the Promotion of Science for Young Scientists for supporting this research. S.F., H.S. and M.N. acknowledge the support by the Special Researchers' Basic Program

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    1

    E-mail: [email protected]

    2

    Present address: Ultrasound Engineering Department, GE Yokokawa Medical System, Ltd., 4-7-127 Asahigaoka, Hino-shi, Tokyo 191-8503, Japan.

    3

    Present address: Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan.

    4

    Present address: Hitachi, Ltd., Central Research Laboratory 1-280, Higashi-koigakubo, Kokubunji-shi, Tokyo 185-8601, Japan.

    5

    Present address: Roland Berger and Partner GmbH, Arabellastrasse 33, D-81925 München, Germany.

    6

    Present address: The Energy Research Center, Wakasa Bay, Tsuruga-shi, Fukui 914-0047, Japan.

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