Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semi-classical Computation of Low-energy Collisions Cross Section in
  Mutual Neutralization of Helium and Hydrogen Ions   A Semi-classical model is employed to theoretically study mutual
neutralization in the collisions of $\mathrm{^4He^+}$ and $\mathrm{H^-}$. The
model includes nine covalent states of $\mathrm{^2\Sigma^+}$ symmetry. Here the
assumption is that only two states are interacting at a given internuclear
position. The reaction is studied for collisions energies below 100 $eV$. The
total mutual neutralisation cross section is computed and compared with
previous results

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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs