Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One-center calculations of the electron-positron pair creation in
  low-energy collisions of heavy bare nuclei   The probabilities of bound-free electron-positron pair creation are
calculated for head-on collisions of bare uranium nuclei beyond the monopole
approximation. The calculations are based on the numerical solving of the
time-dependent Dirac equation in the target reference frame with multipole
expansion of the projectile potential. In addition, the energy dependence of
the pair-creation cross section is studied in the monopole approximation.

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The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol