Calculation of the spectrum of the superheavy element Z=120
  High-precision calculations of the energy levels of the superheavy element Z=120 are presented. The relativistic Hartree-Fock and configuration interaction techniques are employed. The correlations between core and valence electrons are treated by means of the correlation potential method and many-body perturbation theory. Similar calculations for barium and radium are used to gauge the accuracy of the calculations and to improve the ab initio results. 
T.H. Dinh, V.A. Dzuba, V.V. Flambaum, and J.S.M. Ginges