Microscopic Calculations of Nuclear EDM

We carry out the microscopic calculations of the atomic EDM in deuterium, Xe and Hg atomic systems. Due to Schiff's theorem, we obtain the atomic EDM only from the finite nuclear size effects, but it is found that the atomic EDM is appreciably larger than expected. This is essentially due to the new mechanism in which the nuclear excitations are taken into account while atomic states stay in the ground state. The EDM of deuterium is found to be $d_D \simeq 0.017 d_n$ while the EDM of Xe and Hg become $d_{\rm Xe} \simeq 1.6 d_n$ and $d_{{\rm Hg}} \simeq -2.8 d_n$, respectively. It turns out that the new constraint on the neutron EDM becomes $d_n \simeq (0.37\pm 0.17 \pm 0.14)\times 10^{-28} {\rm e}\cdot {\rm cm}$.