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Solid State Information from Magnetic Hyperfine Interaction Studied In-Beam

Perturbed angular distribution methods (PAD) following nuclear reactions have been employed to study hyperfine interactions in solids. Special properties of these In-Beam techniques are discussed. The large number of nuclear probes, the inherent time scale given by the lifetimes of the excited states, the independence of the alignment on macroscopic parameters and other features, allow investigations which are able to compete with other methods or are even exclusive. Measurements of magnetic hyperfine interactions such as hyperfine fields, critical exponents or Knight shifts are reviewed and discussed with regard to the specific properties.