A compact all-electric Figure-8 spin-transparent storage ring at JLab could directly measure the electron EDM at about 5.8e-30 ecm and detect axion-induced spin precession at 0.2 nHz, if one-day spin coherence holds.
Schiff Screening of Relativistic Nucleon Electric-Dipole Moments by Electrons
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abstract
We show, at leading-order in the multipole expansion of the electron-nucleus interaction, that nucleon electric-dipole moments are completely shielded by electrons so that they contribute nothing to atomic electric-dipole moments, even when relativity in the nucleus is taken into account. It is well known that relativistic electron motion, by contrast, leads to dipole moments that are not screened; we discuss the reasons for the difference.
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High Precision Fundamental Physics Experiments at JLab with Spin-transparent Storage Rings of Low-energy Polarized Electron Beams
A compact all-electric Figure-8 spin-transparent storage ring at JLab could directly measure the electron EDM at about 5.8e-30 ecm and detect axion-induced spin precession at 0.2 nHz, if one-day spin coherence holds.