Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical study of electronic structure of hafnium (Hf, Z=72) and
  rutherfordium (Rf, Z=104) atoms and their ions: Energy levels and hyperfine
  structure constants   Energy levels, magnetic dipole, and electric quadrupole hyperfine structure
of the superheavy element rutherfordium (Rf, $Z$=104) and its first three ions
are calculated using a combination of the configuration interaction,
coupled-cluster single-doubles, and many-body perturbation theory techniques.
The results are to be used in future interpretations of the measurements in
terms of nuclear magnetic dipole and electric quadrupole momenta. To have a
guide on the accuracy of the study, we perform similar calculations for hafnium
(Hf, $Z$=72) and its ions. Hf is a lighter analog of Rf with a similar
electronic structure. Good agreement with the experiment for Hf and with
available previous calculations of the energy levels of Rf is demonstrated.

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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: acc-phys