Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic scattering with a singular potential in the Dirac equation   An elementary treatment of the Dirac equation in the presence of a three
dimensional spherically symmetric delta potential is presented. We show how to
calculate the cross section using the relativistic wave expansion method for a
one delta potential and two concentric delta potentials. We compare our results
with the cross section calculated in the Born approximation.

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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int