Conclusions

We have calulated the Schiff moment in $^{225}$Ra in the approximation that the T-violating interaction has zero range. Our calculations, which are self-consistent and include core polarization, give results that are generally a few times smaller than earlier estimates based on the particle-rotor model. Accepting the very recent results of Ref. [Dmitriev and Sen'kov()], we currently find the Schiff moment of $^{225}$Ra to be (generically) several hundred times that of $^{199}$Hg, though the enhancement factor depends significantly on the source of T violation, and we expect it to decrease at least a little when we use the finite-range force. Work towards including a finite range in HFODD is in progress. We also plan to apply the self-consistent methods used here to other light actinides, as well as to $^{199}$Hg, where we suspect octupole correlations may play some role [Engel et al.(1999)Engel, Friar, and Hayes]. Maintaining self consistency in $^{199}$Hg should automatically control the spurious Schiff strength encountered in Ref. [Dmitriev and Sen'kov()].

After many years of neglect, the question of which isotopes are best for EDM measurements is now being rapidly addressed.