Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An aberrant "spin-orbit interaction" persists in the literature since
  more than thirty years   An expression for the spin-orbit interaction coupling between different
levels, which was shown to be aberrant more than thirty years ago is used in a
recent article [K. Amos, L. Canton, G.Piseni, J. P. Svenne and D. van der
Knijff, Nucl. Phys. A 728, 65 (2003)]. It leads to expressions quite simpler
than they should be. Its behavior is in fact of a character opposite to that of
the spin-orbit interaction used in two-body studies.

23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an