Calculations of the atomic structure for the low-lying states of actinium

Abstract

We employ a technique that combines the configuration interaction method with the singles-doubles coupled-cluster method to perform calculation of the energy levels, transition amplitudes, lifetimes, g-factors, and magnetic dipole and electric quadrupole hyperfine structure constants for many low-lying states of neutral actinium. We find very good agreement with existing experimental energy levels and make accurate predictions for missing levels. It has been noted that some of the levels have been previously misidentified; our analysis supports this claim. If spectroscopy is performed with actinium-225, our calculations will lead to values for nuclear structure constants. The accuracy of this can be constrained by comparing with actinium-227.

References in corpus (6)

• Development of a configuration-interaction + all-order method for atomic calculations
• Parity and Time-Reversal Violation in Atomic Systems
• Core-valence correlations for atoms with open shells
• Combination of the single-double coupled cluster and the configuration interaction methods; application to barium, lutetium and their ions
• Relativistic all-order calculations of Th, Th${}^{+}$ and Th${}^{2+}$ atomic properties
• Spectra of barium, radium, and element 120; application of the combined correlation potential, singles-doubles, and configuration interaction ab initio method

Cited by in corpus (3)

• Recent progress in laser spectroscopy of the actinides
• Detection of missing low-lying atomic states in actinium
• Simulating optically-active spin defects with a quantum computer