Relativistic configuration interaction plus linearized-coupled-cluster calculations ofU2+energies,gfactors, transition rates, and lifetimes

Coupled-cluster and configuration-interaction calculations for heavy nuclei.

We compare coupled-cluster (CC) and configuration-interaction (CI) results for (56)Ni obtained in the pf-shell basis, focusing on practical CC approximations that can be applied to systems with dozens or hundreds of correlated fermions. The weight of the reference state and the strength of correlation effects are controlled by the gap between the f(7/2) orbit and the f(5/2), p(3/2), p(1/2) orbi...

Relativistic Configuration Interaction Calculations for Lanthanide and Actinide Anions

Coupled-cluster and configuration-interaction calculations for odd-A heavy nuclei.

We compare coupled-cluster (CC) and configuration-interaction (CI) results for 55Ni and 57Ni obtained in the pf-shell basis, focusing on the practical equation-of-motion (EOM) CC approximations that can be applied to systems with dozens of correlated fermions. The weight of the reference state and the strength of correlation effects are controlled by the gap between the f7/2 orbit and the f5/2,...

Relativistic many-body calculations of electric-dipole lifetimes, transition rates, and oscillator strengths for n = 3 states in Al-like ions

Transition rates, oscillator strengths, and line strengths are calculated for electric-dipole(E1) transitions between even-parity 3s3p, 3s3d, 3p3d, 3d3s and 3d states and odd-parity3s3p, 3p, 3s3p3d, and 3d3p states in Al-like ions with the nuclear charges ranging fromZ = 15 to 100. Relativistic many-body perturbation theory (MBPT), including the Breitinteraction, is used to eval...

All-Order Methods for Relativistic Atomic Structure Calculations

All-order extensions of relativistic atomic many-body perturbation theory are described and applied to predict properties of heavy atoms. Limitations of relativistic many-body perturbation theory are first discussed and the need for all-order calculations is established. An account is then given of relativistic all-order calculations based on a linearized version of the coupled-cluster expansio...