Recoil Radiation Damage Following Coulomb Excitation
Coulomb excitation by 6-MeV alpha particles has been used to produce excited states of Hf178, Hf180, Hf177, W182, W183, W184, and W186. The Mössbauer effect of hafnium in several refractory hafnium compounds and of tungsten in tungsten metal has been observed. In all experiments, anomalous hyperfine structure or line broadening was observed. Simultaneous measurements of the absorber thickness dependence of Mössbauer spectra of the even-even isotopes of tungsten have yielded the narrowest sources yet reported for W184 and W186. Although the observed spectra for W186 are narrower than what is expected from electronic lifetime measurements, it is likely that broadened lines have been observed. The anomalous hyperfine structure and line broadening are interpreted to be the result of radiation damage produced by replacement collisions made by excited nuclei. In all cases, the anomalous structure can be interpreted as electric quadrupole interactions.
KeywordsNickel Helium Epoxy Hexagonal Tungsten
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