First measurement of the atomic electric dipole moment of Ra 225

R. H. Parker, M. R. Dietrich, M. R. Kalita, N. D. Lemke, K. G. Bailey, M. Bishof, J. P. Greene, R. J. Holt, W. Korsch, Z. T. Lu, P. Mueller, T. P. O'Connor, J. T. Singh

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88 Scopus citations


The radioactive radium-225 (Ra225) atom is a favorable case to search for a permanent electric dipole moment. Because of its strong nuclear octupole deformation and large atomic mass, Ra225 is particularly sensitive to interactions in the nuclear medium that violate both time-reversal symmetry and parity. We have developed a cold-atom technique to study the spin precession of Ra225 atoms held in an optical dipole trap, and demonstrated the principle of this method by completing the first measurement of its atomic electric dipole moment, reaching an upper limit of |d(Ra225)|<5.0×10-22ecm (95% confidence).

Original languageEnglish
Article number233002
JournalPhysical Review Letters
Issue number23
StatePublished - Jun 9 2015

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society.

ASJC Scopus subject areas

  • General Physics and Astronomy


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