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Accurate atomic structure calculations of complicated atoms with 4 or morevalence electrons begin to push the memory and time limits of supercomputers.This paper presents a robust method of decreasing the size of \textit{abinitio} configuration interaction and many-body perturbation theorycalculations without undermining the accuracy of the resulting atomic spectra.Our method makes it possible to saturate the CI matrix in atoms with manyvalence electrons. We test our method on the five-valence-electron atomtantalum and verify the convergence of the calculated energies. We then applythe method to calculate spectra and isotope shifts of tantalum's superheavyanalogue dubnium. Isotope-shift calculations can be used to predict the spectraof superheavy isotopes which may be produced in astrophysical phenomena.

Saturated configuration interaction calculations for five-valent Ta and Db