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8 papers · 2 filters
Prediction of quantum many-body chaos in protactinium atom
A. V. Viatkina, M. G. Kozlov, V. V. Flambaum
Energy level spectrum of protactinium atom (Pa, Z=91) is simulated with a CI calculation. Levels belonging to the separate manifolds of a given total angular momentum and parity $J…
Combining configuration interaction with perturbation theory for atoms with large number of valence electrons
V. A. Dzuba, J. Berengut, C. Harabati +1
A version of the configuration interaction (CI) method is developed which treats highly excited many-electron basis states perturbatively, so that their inclusion does not affect t…
Electron structure of superheavy elements Uut, Fl and Uup (=113 to 115)
V. A. Dzuba, V. V. Flambaum
We use recently developed method of accurate atomic calculations which combines linearized single-double coupled cluster method with the configuration interaction technique to calc…
All-order calculations of the spectra of superheavy elements E113 and E114
T. H. Dinh, V. A. Dzuba
We apply a recently developed method (V. A. Dzuba, PRA 90, 012517 (2014); J. S. M. Ginges and V. A. Dzuba, PRA 91, 042505 (2015)) to calculate energy levels of superheavy elements…
Unexpectedly large difference of the electron density at the nucleus in the 4p P fine-structure doublet of Ca
C. Shi, F. Gebert, C. Gorges +9
We measured the isotope shift in the S-P (D2) transition in singly-ionized calcium ions using photon recoil spectroscopy. The high accuracy of the technique…
Limits on gravitational Einstein Equivalence Principle violation from monitoring atomic clock frequencies during a year
V. A. Dzuba, V. V. Flambaum
Sun's gravitation potential at earth varies during a year due to varying Earth-Sun distance. Comparing the results of very accurate measurements of atomic clock transitions perform…