Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple functional form for proton-${}^{208}$Pb total reaction cross
  sections   A simple functional form has been found that gives a good representation of
the total reaction cross sections for the scattering from ${}^{208}$Pb of
protons with energies in the range 30 to 300 MeV.

16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th