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.
KeywordsRadiation Damage Coulomb Excitation Mossbauer Spectrum Recoil Nucleus Excited Nucleus
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- 1.C. G. Jacobs, Jr., and N. Hershkowitz, Phys. Rev. B1,839 (1970).Google Scholar
- 2.J. C. Walker and Y. K. Lee, in Mössbauer Effect Methodology, Vol. 3,1. Gruverman, ed. (Plenum Press, New York, 1967).Google Scholar
- 3.C. M. Lederer, J. M. Hollander, and I. Perlman, Table of Isotopes (John Wiley and Sons, New York, 1967).Google Scholar
- 5.J. R. Beeler, Jr., and D. G. Besco, “Knock-on Cascades and Point Defect Configurations in Binary Materials,” in Proc. Symp. Radiation Damage in Solids, Venice, 1962 (International Atomic Energy Commission, Vol. 1, yienna, 1962).Google Scholar
- 6.G. M. Kalvius, G. D. Sprouse, and S. S. Hanna, in Hyperfine Structure and Nuclear Radiations, E. Matthias and D. A. Shirley, eds. (Interscience Publishers, New York, 1968).Google Scholar
- 11.Clarence, G. Jacobs, Jr., Ph.D. Thesis, University of Iowa, 1969 (unpublished).Google Scholar
- 12.E. Gerdau, P. Steiner, and D. Steenken, in Hyperfine Structure and Nuclear Radiations, E. Matthias and D. A. Shirley, eds. (Interscience Publishers, New York, 1968), p. 261.Google Scholar
- 13.R. E. Snyder, J. W. Ross, and D. St. P. Bunbury, J. Phys. C1, 1662 (1968).Google Scholar
- 16.M. W. Mekshes and N. Hershkowitz, Phys. Rev. C2, 289 (1970).Google Scholar
- 17.K. Hardy, D. Rüssel, and R. Wilenzick, Phys. Letters A26:422 (1968).Google Scholar