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HK: Hadronen und Kerne

HK 7: Nuclear Moments

HK 7.2: Talk

Monday, March 16, 1998, 14:15–14:30, E

β LMR-NMR: a new method to measure quadrupole and magnetic moments. — •S. Teughels¹, N. Coulier¹, G. Neyens¹, G. Georgiev¹, S. Ternier¹, K. Vyvey¹, C. L’Abbé¹, W. Rogers², D.L. Balabanski¹, A. Lépine-Szily³, and R. Coussement¹ — ¹Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium — ²Westmond College, Department of Physics, CA-93108 Santa Barbara, U.S.A. — ³Institute of Physics, University of São Paulo, C.P. 66318, 05389-970, São Paulo, Brasil

By combining two methods, the level mixing resonance (LMR) and the nuclear magnetic resonance (NMR), one can determine the magnetic moment and the quadrupole moment of nuclei with low spin. The nuclei are oriented by the nuclear reaction. In high-energy reactions we want to select the reaction products emitted in the forward direction to have the maximum production-rate. This means we start with initial alignment. By applying an electric field gradient and an RF-signal we change the orientation of the nuclear spins (polarization is induced) at specific values of a static magnetic field. We measure the resonantly change of the β-asymmetry as a function of this magnetic field. The ratio of the quadrupole moment to the magnetic moment can be directly derived from the level mixing resonance field, and the magnetic moment from the nuclear magnetic resonance fields. The idea of combined β LMR-NMR has been tested on ¹²B in a Mg single crystal.