Until yesterday I thought they have. Googling a little bit around the measured values, I've found nothing.
As I've heard on the chat, the nuclei don't have an EDM. Although it would be possible by the symmetry violations of the weak interaction, it doesn't happen.
But I am asking not for the EDM due to weak asymmetry. I am asking for the lack of the EDM due to the asymmetric charge distribution in them.
Nuclei have a lot of elementary particles, interacting in quite complex ways (strong, EM and weakly). Why should the charges be distributed in them always to a 0 EDM? What is the mechanism, or what is the reason, to zero out any EDM in them?
Answer
The expectation value of the dipole moment operator for states of definite parity is zero. This is because the dipole moment operator is odd operator.
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