May 29, 2018 to June 3, 2018
Hyatt Regency Indian Wells Conference Center
US/Pacific timezone

The Radium-225 Experiment

May 29, 2018, 5:30 PM
North Foyer | Kachina Room (Hyatt Regency Indian Wells Conference Center)

North Foyer | Kachina Room

Hyatt Regency Indian Wells Conference Center

44600 Indian Wells Lane, Indian Wells, CA 92210, USA


Dr Matthew Dietrich (Argonne National Laboratory)


Due to its large nuclear octupole deformation and high atomic mass, the radioactive isotope $^{225}$Ra is a favorable case to search for an electric dipole moment (EDM); it is particularly sensitive to CP-violating interactions in the nucleus. However, its scarcity and low vapor pressure present significant challenges. To measure this rare isotope, we have developed an approach to measuring atomic EDMs by using lasers to cool radium atoms to 40 micro-Kelvin, and then we trap those atoms in an optical dipole trap. The atoms are then allowed to precess in magnetic and strong electric fields. Using this method, we have found the EDM of radium to be less than $1.4\times 10^{-23}$ e-cm (95% C.L.). Upcoming improvements are expected to dramatically improve our sensitivity, and significantly improve on the search for new physics in several sectors.
E-mail [email protected]
Funding source Work supported by the DOE Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.

Primary author

Dr Matthew Dietrich (Argonne National Laboratory)

Presentation materials