Actinide Mossbauer resonances

Nuclear hyperfine parameters of important Mossbauer resonances in the actinides and lanthanides. 

Fig. 13. Plot of isomer shifts for different compounds of the important zero Mossbauer resonances in lanthanides and actinides. The contact density p(0) always increases from bottom to top. The actual values of shifts cannot be compared directly for the different resonances (see text), but their general tendencies can. In the lanthanides it is possible to separate roughly conducting and nonconducting compounds. In the actinides this is more difficult and needs more detailed analysis (see section 6). In all cases, however, conduction electrons produce an increase in contact density.

Parameters of selected Mossbauer resonances in lanthanides and actinides. 

In conclusion, we might mention that Pa (84keV) is basically also a fine Mossbauer resonance in the actinide regime. Unfortunately the scarcity of Pa has prevented this resonance to come into greater use despite the fact that the original source problems could be overcome (Friedt et al. 1981). Perhaps the future will bring improvement, a strong effort would be commendable. 

Thus far it was tacitly assumed that the magnetic moments rest on the Mossbauer atoms. For Mossbauer spectroscopy with lanthanide and actinide resonances this is... 

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