First Measurement of the Atomic Electric Dipole Moment ofRa<mml:mprescripts/><mml:none/>225

2015/06/09 by Richard H. Parker, Matthew Dietrich, M. Kalita +10 · 2 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Dark Matter and Cosmic Phenomena

paper · doi:10.1103/physrevlett.114.233002

openalex publication_date 2015/06/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

The radioactive radium-225 ((225)Ra) atom is a favorable case to search for a permanent electric dipole moment. Because of its strong nuclear octupole deformation and large atomic mass, (225)Ra 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 (225)Ra 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((225)Ra)|<5.0×10(-22) e cm (95% confidence).

Citations

• Coherent population transfer among quantum states of atoms and molecules
• Nuclear Time-Reversal Violation and the Schiff Moment ofRa<mml:mprescripts/><mml:none/>225
• Calculation of energy levels and transition amplitudes for barium and radium
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron

Cited by

• Reduced Limit on the Permanent Electric Dipole Moment ofHg<mml:mprescripts/><mml:none/>199
• Radium [wikipedia]