Abstract
Radioactive 90Nb ( T 1 2 = 14 h ) was recoil implanted into thin Fe foils. The magnetic hyperfine interaction was measured with nuclear magnetic resonance on oriented nuclei. The resonance signal consists of two dominant contributions: About 90% is concentrated around 125 MHz, which is attributed to Nb nuclei on substitutional (“S”) sites with a more or less undisturbed surrounding. About 10% of the NMR-ON signal appears in a broad resonance centered at ∼ 108 MHz, the details of the lattice (“N”) site being unknown. For both sites, the nuclear spin-lattice relaxation was measured. Whereas ( B HF ( N) B HF ( S) ) 2 = 0.74 , the ratio of the Korringa constants for the spin-lattice relaxation on N and S sites is found to be C K ( N) C K ( S) = 1.03(5) .
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