Abstract
The magnetic hyperfine field acting on19F nuclei in a cubic cobalt lattice at a temperature of 450 °C has been investigated. Time dependent spin rotation has been observed following the excitation and recoil implantation with a pulsed α-particle beam using the reaction19F(α,α′)19F*. The hyperfine field isH hf (450 °C)=31.4 ± 0.5 kG. The measured amplitude of the spin rotation is only 18% of the amplitude expected for the case where all19F* nuclei are assumed to be subject to the same hyperfine field without any further perturbation. This was established by means of other implantation experiments with a copper backing using first the pulsed beam technique followed by a γ-ray angular distribution measurement in coincidence with backscattered α-particles. In copper a fast perturbation was found, which reduces the anisotropy to about 80% within a short time interval immediately after the excitation.
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Work supported by Bundesministerium für Bildung und Wissenschaft.
We wish to thank Mr. P. Betz, R. Brenn, Dr. L. Lehmann, Dr. H. Spehl, N. Wertz and H. Wolf for their help during the experiments.
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Bosch, F., Klepper, O. Perturbed angular distribution of recoil implanted19F-nuclei in a cobalt and copper environment. Z. Physik 240, 153–162 (1970). https://doi.org/10.1007/BF01395629
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DOI: https://doi.org/10.1007/BF01395629