What if the nucleus has a magnetic moment, and also the electron shell has one? I suspect, in this case, the orientation of the nucleus could be "fixed" by the electron shell.
Maybe a mono-crystal of such a material would have an anisotropic radioactivity. Thus, its radioactivity wouldn't be the same in all directions.
I think, relative many requirements should be fulfilled:
- The nucleus must be radioactive.
- It must have a magnetic moment.
- The electron shell must have also a magnetic moment.
- The orientations of the atoms in the crystal structure should be unidirectional.
Is it possible? Does any such crystal already exist? Maybe the crystal of a radioactive isotope of some ferromagnetic element could fulfill all of these?
If not, why not?