Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session C03: Focus Session: Fundamental Physics with Radioactive Species (GPMFC)Focus Live Streamed
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Chair: Nick Hutzler, Caltech Room: Grand Ballroom B |
Tuesday, May 31, 2022 11:00AM - 11:30AM |
C03.00001: Searching for symmetry violations with radioactive molecules Invited Speaker: Andrew Jayich The Universe's matter-antimatter imbalance (baryogenesis) and the absence of charge conjugation and parity (CP) violation in strong interactions (the strong CP problem) are leading motivations to search for time reversal symmetry violation (TSV). Constraining TSV in nuclei and nucleons is intriguing, as such an experiment is sensitive to physics that addresses both problems through underlying hadronic interactions. Heavy elements are a natural choice for such experiments, because sensitivity scales as the atomic number cubed. Radium is such a heavy element, but it comes with an additional enhancement to TSV: a nucleus that has an octupole deformation. The enhancement can be further augmented by incorporating radium into a molecule. We discuss our work towards an experiment which aims to use a single radium-bearing molecular ion to constrain sources of TSV. |
Tuesday, May 31, 2022 11:30AM - 12:00PM |
C03.00002: Electronic structure theory of exotic atoms and molecules Invited Speaker: Anastasia Borschevsky Experiments on heavy and radioactive atoms and molecules are extremely challenging due to the short lifetimes and the low quantities of these species. Specially developed experimental techniques are thus needed to carry out such studies, but no less important for their success is strong and reliable theoretical support. For example, predictions of spectroscopic properties are necessary for planning the measurements and the possible laser cooling or trapping schemes. Furthermore, theoretical input is crucial for interpreting these measurements and provides the link between the experimental spectroscopy and the nuclear and particle physics. Knowledge of various electronic coupling factors is needed to extract the properties of interest, such as the electron EDM, the anapole moments, or any other parity violating property. These coupling factors cannot be measured, and are provided from electronic structure calculations. |
Tuesday, May 31, 2022 12:00PM - 12:12PM |
C03.00003: Theoretical study of properties of AcF. Aleksandra A Kiuberis, Anastasia Borschevsky, Lukáš F Pašteka Heavy diatomic molecules are currently considered to be among the most sensitive systems used in the search for the P,T-violating effects and in probing of the Standard Model of particle physics. In certain molecules effects resulting from both parity violation and time-reversal violation (P,T- odd effects) are considerably enhanced with respect to atomic systems. The strength of these interactions grows with atomic number, nuclear spin and nuclear deformation. Molecules with atomic nuclear octupole deformation are sensitive for investigating of parity and time-reversal violating effects, in particular nuclear EDM. Diatomic molecule AcF has been proposed to be sensitive to the Schiff moment of the Ac nucleus\cite{FD,CHo}. Nowadays different laboratories plan to perform experimental study of radioactive AcF in aim to measure isotopologue shifts and hyperfine structure and achieve first successful measurements of the Schiff moment. |
Tuesday, May 31, 2022 12:12PM - 12:24PM |
C03.00004: Progress on a More Sensitive Measurement of the Atomic Electric Dipole Moment of Radium-225 and Radium-223 Gordon Arrowsmith-Kron, Kevin G Bailey, Michael N Bishof, Matt D Gott, John P Greene, Peter Mueller, Tom O'Connor, Jaideep T Singh, Matthew R Dietrich A non-zero permanent atomic electric dipole moment (EDM) indicates a time-reversal (T) violation. Assuming CPT symmetry, this makes non-zero permanent EDMs a signature of CP violation, and EDM measurements a potential source of evidence of new physics. In large-Z atoms with octopole deformed nuclei, such as Radium-225 and Radium-223, the observable EDM effect is enhanced, effectively improving the precision of the measurement. In the Ra EDM experiment, Radium atoms are vaporized, laser cooled, trapped, and transported between a pair of high-voltage electrodes. Here we report progress towards trapping Radium-223 for the first time and measuring its EDM with the Ra EDM apparatus. In addition, a variety of upgrades that improve its sensitivity are discussed. These upgrades include the construction of a new atomic beamline, which implements atom trapping on a more efficient cooling transition. We expect this improvement to increase our trapping efficiency by two orders of magnitude. |
Tuesday, May 31, 2022 12:24PM - 12:36PM |
C03.00005: A radium ion optical clock Mingyu Fan, Craig Holliman, Asad Contractor, Samuel M Brewer, Andrew Jayich We report the operation of a ${}^{226}\mathrm{Ra}^+$ single ion optical clock with a frequency instability of $\SI{1.1e-13}{}/\sqrt{\tau}$ and systematic fractional uncertainty of $\SI{9e-16}{}$. With the clock, we measured the ratio of the $D_{5/2}$ state to the $S_{1/2}$ Land\'{e} $g$-factors, $g_{D}/g_{S}$ = $\SI{0.5988053\pm.0000011}{}$. The radium ion has a small negative differential scalar polarizability that reduces leading systematic effects such as the black-body radiation shift, and transition wavelengths that are suitable for integrated photonics. These properties make the radium ion clock promising for a transportable optical clock. The radium ion clock could also improve limits on the time variation of the fine structure constants in an optical frequency comparison. |
Tuesday, May 31, 2022 12:36PM - 12:48PM |
C03.00006: First Measurement of the 7s−8s M1 Transition in Francium Tim Hucko, Seth Aubin, John A Behr, Eduardo Gomez, Alexandre Gorelov, Gerald Gwinner, Luis A Orozco, Anima Sharma, Andrea Teigelhoefer Atomic parity-violation (APV) experiments play an important role as low-energy, neutral current, searches for physics beyond the Standard Model. Francium is an ideal candidate for APV experiments due to its high-Z and single valence electron. Our planned Fr APV experiment will probe the 7s−8s transition (506 nm) in an external electric field. Relativistic effects and hyperfine interactions give rise to an extremely weak magnetic dipole (M1) transition, with oscillator strength f ∼10−13. In our experiment we use a magneto-optical trap to cool and trap 211Fr between a pair of transparent indium tin oxide field plates. To detect the faint M1 transition, we use an ultra-high vacuum compatible power build-up cavity that enhances the light power ∼ 4000 fold. I will discuss our measurements of the M1 and Stark-induced E1 transitions. Their comparison allows us to extract the strength of the relativistic M1 amplitude and compare it to recent theoretical predictions from literature. Our preliminary results suggest this first measurement will have better than 10% accuracy on the relativistic contribution to the M1 transition, similar to the difference between theory and experiment of the analogous transition in Cs. |
Tuesday, May 31, 2022 12:48PM - 1:00PM |
C03.00007: Towards an improved Penning trap measurement of the mass difference between tritium and helium-3 Edmund G Myers, David J Fink, Moises Medina Restrepo Motivated by the ongoing KATRIN and developing Project-8 tritium beta-decay neutrino mass experiments, we plan to reduce the uncertainty on the mass difference between tritium and helium-3 [1]. Progress towards an improved measurement will be reported. |
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