A New Concept for Searching for Time-Reversal Symmetry Violation Using Pa-229 Ions Trapped in Optical Crystals

Abstract

Certain pear-shaped nuclei are expected to have enhanced sensitivity to time-reversal and parity-violating interactions originating within the nuclear medium. In particular, Protactinium-229 is thought to be about 100,000 times more sensitive than Mercury-199 which currently sets some of the most stringent limits for these types of interactions. Several challenges would first have to be addressed in order to take advantage of this discovery potential. First, there is not currently a significant source of Pa-229 (1.5 day half-life); however, there are plans to harvest Pa-229 at the Facility for Rare Isotope Beams at Michigan State University. Second, the spin-5/2 nucleus of Pa-229 limits its coherence time while also making it sensitive to systematic effects related to local electric field gradients. On the other hand, this also give Pa-229 an additional source of signal in the form of a magnetic quadrupole moment (MQM) which violates the same symmetries as an EDM but is not observable in spin-1/2 systems. Third, in order to compensate for the small atom numbers and short coherence times, the Pa-229 atoms would have to be probed with exceptionally large electric and magnetic fields that may be possible if Pa-229 ions are embedded inside an optical crystal. We will describe some aspects of this concept using the stable Praseodymium-141 isotope as a surrogate which has the same nuclear spin and similar atomic structure of Pa-229.

arXiv commentProceedings for the 7th International Conference on Trapped Charged Particles and Fundamental Physics (TCP2018) held in Traverse City, Michigan from September 30 to October 5, 2018

References in corpus (17)

• Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron
• Electric dipole moments as probes of new physics
• Observation of Large CP Violation in the Neutral B Meson System
• Electric Dipole Moments of Nucleons, Nuclei, and Atoms: The Standard Model and Beyond
• A Revised Experimental Upper Limit on the Electric Dipole Moment of the Neutron
• Electric Dipole Moments of the Atoms, Molecules, Nuclei and Particles
• Electroweak Baryogenesis and Standard Model CP Violation
• A precision measurement of the electron's electric dipole moment using trapped molecular ions
• Measurement of the CP-Violating Asymmetry Amplitude sin2beta
• Constraints on CP-violating Higgs couplings to the third generation
• Electric dipole moments of Hg, Xe, Rn, Ra, Pu, and TlF induced by the nuclear Schiff moment and limits on time-reversal violating interactions
• Improved limit on the ${}^{225}$Ra electric dipole moment
• Correlating Schiff moments in the light actinides with octupole moments
• Orientation-dependent hyperfine structure of polar molecules in a rare-gas matrix: a scheme for measuring the electron electric dipole moment
• Model-independent determinations of the electron EDM and the role of diamagnetic atoms
• Electric dipole moments of actinide atoms and RaO molecule
• Production yield of rare-earth ions implanted into an optical crystal

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