beta-NMR and Nuclear Spin Diffusion in a Spatially Disordered Subsystemстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The results of theoretical and experimental investigations of delocalization of nuclear polarization in spatially disordered media are presented. The experiment is based on the measurement of a depolarization of beta-active (8)Li impurity nuclei (beta-nuclei) in the spatially disordered subsystem of (8)Li-(6)Li nuclei in LiF single crystals. The process is determined by the dipole-dipole interaction in this subsystem and by its dipole interactions with nuclei of the (7)Li(19)F matrix. It is effective in a wide range of external magnetic fields H(0) = 200-3000 G owing to proximity of g-factors. The kinetics of a depolarization of beta-nuclei at the (6)Li concentration c = 0.15-10.06% in fields H(0) = 200 and 1210 G is investigated. A satisfactory explanation of the results is based on the numerical-analytical simulation of the process.