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

We have calculated the energies of some low-lying levels ($6d7s^2,$ $6d^2 7s,$ $6d7s7p$ and $6d^27p$) 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.