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Physics Colloquium Series: Dr. Matthew Dietrich
(Physics Lecture Series) Argonne National Laboratory, Physics Division
“Searching for New Physics with Laser- Cooled, Radioactive Atoms”
Electric dipole moments (EDMs) are signatures of time-reversal, parity, and charge-parity (CP) violation, which makes them a sensitive probe of expected new physics beyond the Standard Model, such as supersymmetry. This is because new, undiscovered sources of CP- violation are needed to explain the existence of all matter in the universe. Due to its large nuclear octupole deformation and high atomic mass, the radioactive Ra-225 isotope is a favorable EDM case; it is particularly sensitive to CP-violating interactions in the nuclear medium. To measure this rare isotope, we have developed an approach to measuring EDMs by using lasers to cool those atoms to 40 micro-Kelvins, and trapping them in an optical dipole trap. Using this method, we have found the EDM of radium to be less than 1.4 10–23 e-cm.