Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron Correlation Effects in Hyperfine Interactions in $^{45}$Sc and
  $^{89}$Y   The relativistic coupled-cluster theory has been employed to calculate the
magnetic dipole and electric quadrupole hyperfine structure constants for the
stable isotopes $^{45}$Sc and $^{89}$Y. The role of electron correlation is
found to be very important. The trend exhibited by these effects is rather
different from previously studied single valence atomic systems.

11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga