Electric Dipole Transition Parameters for Low-Lying Levels for Neutral Actinium

We have calculated the energies of some low-lying levels (6d7s, 6d7s, 6d7s7p and 6d7p) and electric dipole transition parameters (wavelengths, oscillator strengths and transition probabilities) between them for neutral actinium (Z = 89). In the calculations, the correlation and relativistic effects are considered by multiconfiguration Hartree–Fock method within the framework Breit–Pauli Hamiltonian. The results obtained are compared with the available experimental and theoretical works in the literature.