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High-precision calculations of the energy levels of the superheavy elementZ=120 are presented. The relativistic Hartree-Fock and configurationinteraction techniques are employed. The correlations between core and valenceelectrons are treated by means of the correlation potential method andmany-body perturbation theory. Similar calculations for barium and radium areused to gauge the accuracy of the calculations and to improve the ab initioresults.Comment: 4 page

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Calculations of the spectra of superheavy elements<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>119</mml:mn></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:msup><mml:mn>120</mml:mn><mml:mo>+</mml:mo></mml:msup></mml:mrow></mml:math>

Calculations of the spectra of superheavy elementsZ=119andZ=120+