Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analytical expressions of the dispersive contributions of the nuclear
  optical model   Analytical solutions of dispersion relations in the nuclear optical model
have been found for both imaginary volume and surface potentials. A standard
Brown-Rho shape has been assumed for the volume imaginary term and a Brown-Rho
shape multiplied by a decreasing exponential for the surface contribution. The
analytical solutions are valid for any even value of the exponent appearing in
these functional forms.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin