Nuclear Magnetic Resonance Technique

G. Neyens,1 N. Coulier,1 S. Teughels,1 G. Georgiev,1 B. A. Brown,2,3 W. F. Rogers,4 D. L. Balabanski,1,* R. Coussement,1 A. Lépine-Szily,5 M. Lewitowicz,6 W. Mittig,6 F. de Oliveira Santos,6 P. Roussel-Chomaz,6 S. Ternier,1 K. Vyvey,1 and D. Cortina-Gil7 1University of Leuven, Instituut voor Kern-en Stralingsfysika, Celestijnenlaan 200 D, B-3001 Leuven, Belgium 2Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 3Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom 4Westmont College, 955 La Paz Road, Santa Barbara, California 93108 5Institute of Physics, University of Sao Paulo, C.P. 66318, 05389-970 Sao Paulo, Brazil 6Grand Accelerateur National d’Ions Lourds, B.P. 5027, F-14076 Caen Cedex 5, France 7Gesellschaft fur Schwerionenforschung, D–64291 Darmstadt, Germany (Received 27 August 1998) The 18N ground state magnetic moment jmj ­ 0.135s15dmN has been measured using a modified b nuclear magnetic resonance technique. The value is compared to shell-model calculations. Spin-aligned 18N projectile fragments were produced in the fragmentation of 22Ne at 60.3 MeVynucleon. Polarization of the nuclear spins was resonantly induced by a combined magnetic dipole, electric quadrupole, and radio frequency interaction. This is the first application of a new method that allows production of polarized nuclei from spin-aligned projectile fragments, allowing one to measure b asymmetries. The method opens a new range of applications to study static dipole and quadrupole moments of exotic nuclei near the drip lines. [S0031-9007(98)08259-3]