Year: 2025
Type: article
Abstract: Motivated by recent experimental advances, including the ongoing development of an optical atomic clock in singly ionised radium, we perform a detailed theoretical characterisation of Ra+ and its lighter analogue, Ba+. Both ions are of interest for precision studies, including for atomic parity violation and searches for new physics beyond the standard model. Using the all-orders correlation potential method, including Breit and radiative quantum electrodynamics corrections, we perform high-accuracy calculations of electric-dipole (E1), electric-quadrupole (E2), and magnetic-dipole (M1) transition matrix elements between the low-lying s, p, and d states of these ions, as well as the excited-state lifetimes, polarizabilities, magic wavelengths, and magnetic dipole (A) hyperfine structure constants. By combining lifetime measurements with precise theoretical ratios, we extract high-accuracy determinations of the s-d_1/2 and s-d_3/2 E2 matrix elements. By combining hyperfine measurements with atomic theory, we extract parameters of the nuclear magnetisation distribution (the Bohr-Weisskopf effect) for 135-, 137-Ba and 223-, 225-Ra. These results provide theoretical input for ongoing and future experimental programs in fundamental physics and precision metrology.
Source: Physical Review A
DOI: 10.1103/1rtb-8ymc
Authors: Robin B. Cserveny, Benjamin M. Roberts
Institutions: University of Vienna, The University of Queensland
Language: English
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4414534832