Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comprehensive calculations of energy levels, radiative transition
  parameters, hyperfine structure constants A$_J$-B$_J$, Land\'e g$_J$ factors
  and isotope shifts for Sc XX   Large scale calculations for the energy levels, transition rates, oscillator
strengths, hyperfine interaction constants, Land\'e g$_J$ factors and isotope
shifts have been performed for $1s^2$ and $1snl \: (n=2-8 $ and $l \leq (n-1)
)$ levels of He-like scandium, Sc XX. The GRASP2018 package based on the
multi-configurational Dirac-Fock method is used to perform these calculations.
The leading quantum electrodynamics corrections, Breit interactions and nuclear
recoil effects are also included in the succeeding relativistic configuration
interaction calculations. The relativistic isotope shift (RIS4) program is used
to determine the mass and field shifts factors. A detailed comparison of the
present results with the corresponding values from the NIST database and other
theoretical work, wherever available, has been done, and an excellent agreement
is achieved. A large section of the results is reported for the first time in
the present work.

32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
19
The categories of this paper are: eess