Abstract
The combined interaction of a static electric field gradient and a static magnetic field with the electromagnetic moments of a nucleus is considered for the case of nuclear orientation at low temperature. The general expression of the angular directional distribution of radiation emitted by the oriented state is developed for polycrystalline samples, where the principal axes of the electric field gradients are randomly distributed with respect to a fixed magnetic field direction. Due to axial symmetry of the ensemble the effect of the quadrupole interaction is reduced to an attenuation factor on the usual B/sub K/ coefficients. Numerical calculations of these attenuation factors for K = 1, 2, and 4 have been performed in the case of the symmetric eltric field gradient for a wide range of electric to magnetic interaction ratios and spin values I = 1,3/2,...,8. Typical attenuation curves for spin 5/2 and 9/2 are presented. Comparing the experimental anisotropies with the tabulated values, one can extract the quadrupole interaction value h..omega../sub Q/.
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