Polarized B-12 nuclei were produced and recoil implanted in single crystals of fcc aluminum. The boron decay asymmetry and relaxation times were measured as a function of external magnetic field values and at different orientation angles of the crystal. To identify the resonances at certain field values in the B-12 depolarization in Al, a consistent theory based on the principle of a multi-spin system and nuclear level-crossing has been developed. A unique identification of the resonances, based on the resonant interaction between boron and particular pairs of aluminum neighbours, is perfectly possible. The strong dissipative coupling of the Al nuclei with the electron bath of the lattice hinders a straightforward interpretation of the resonance width and depth.
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Bibliographic reference
Sheeren, G. ; Vandenbergh, M. ; Coussement, R. ; Cyamukungu, Mathias ; Lehmann, Jean ; et. al. Identification of Cross-relaxation Resonances of B-12 Implanted in Sc Aluminum.Yamada Conference 34 / 9th International Conference on Hyperfine Interactions ( HFI-IX ) (OSAKA UNIV, FAC SCI, DEPT PHYS & LAB NUCL STUDIES, TOYONAKA
(Japan), Aug 17-21, 1992). In: Hyperfine Interactions, Vol. 78, no. 1-4, p. 201-207 (1993)
