Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-orbit splittings of neutron states in $N = 20$ isotones from
  covariant density functionals and their extensions   Spin-orbit splitting is an essential ingredient for our understanding of the
shell structure in nuclei. One of the most important advantages of relativistic
mean-field (RMF) models in nuclear physics is the fact that the large
spin-orbit (SO) potential emerges automatically from the inclusion of
Lorentz-scalar and -vector potentials in the Dirac equation. It is therefore of
great importance to compare the results of such models with experimental data.
We investigate the size of $2p$ and $1f$ splittings for the isotone chain
$^{40}$Ca, $^{38}$Ar, $^{36}$S, and $^{34}$Si in the framework of various
relativistic and nonrelativistic density functionals. They are compared with
the results of nonrelativistic models and with recent experimental data.

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The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci