Abstract
Using the recoil associated with the excitation of the 197 keV level of F 19 by protons, perturbations of the 197 keV γ-angular distribution in tifferent media were explored. The excited nuclei recoiling from a very thin CaF 2 target were stopped in various gases (Ne, Ar, air) or solids (Cu, Au, Ag, Pt, Ni, C). The angular distribution in the experiments with gases was found to be isotropic. This strong perturbation is attributed to a time-dependent hyperfine structure interaction. The time dependence is caused by transitions in the fluorine electron shell during atomic collisions in the gas. The attenuation coefficient G 2 for F 19 nuclei stopped in metals were found to be larger than 0.20 except for nickel.
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