Observation of Mössbauer Effects in the Decay of Coulomb Excited Nuclear Levels
The techniques of Mössbauer spectroscopy using Coulomb-excited nuclear levels are discussed. Primary emphasis is on mew Mössbauer levels in the rare-earth region, and on the experimental techniques used to provide cooled targets and absorbers in order to see Mössbauer effects of reasonable size. The problem of radiation damage in the target is discussed, and some conjectures are advanced to explain the absence of appreciable distortions in the resulting Mössbauer hyper-fine spectra. Results of a study of the even isotopes of ytterbium are presented as an example of the use of the above techniques in studying nuclear systematks. The Mössbauer-effect results for the quadrupole moments of the first excited states of these isotopes are compared with previous values obtained by using the collective model and measured Coulomb-excitation cross sections.
KeywordsQuadrupole Moment Hyperfine Structure Recoil Energy Coulomb Excitation Cold Finger
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