โ Scribed by Y. Kisselev; J. Ball; G. Baum; P. Berglund; N. Doshita; F. Gautheron; St. Goertz; N. Horikawa; J. Koivuniemi; K. Kondo; A. Magnon; W. Meyer; G. Reicherz
No coin nor oath required. For personal study only.
We have experimentally studied the first and the second moments of D, 6 Li and 7 Li รฐI > 1 2 ร NMR lines in a granulated LiD-target material as a function of nuclear polarizations and the data has been compared with a theory elaborated by Abragam, Roinel and Bouffard for monocrystalline samples. The experiments were carried out in the large COMPASS twin-target at CERN. The static local magnetic field of the polarized nuclei was measured by frequency shift between the NMR-signals in the two oppositely polarized cells and lead to the first moment, whereas the investigation of the second moment was done through Gaussian approximation. The average field magnitude in granulated material was estimated 20% larger than the value given by the calculations for monocrystalline samples of cylindrical shape. The second moment shows a qualitative agreement with the theory but it is slightly larger at the negative than at the positive polarization. In a polarized mode, the moments depend on the saturated microwave field.
๐ SIMILAR VOLUMES
Averaged local field intensities are calculated for isotropic composites III the MaxweU-Gamett and in the effective medwrn theories. Exact upper and lower bounds on these intensities are also found. Impbcations for photophywal propertIes of mok ecules embedded in the composites are duewed.