Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The solution to a multichannel Bethe potential and its application to
  pion-nucleus reactions   We solve a radial Schr\"odinger equation for the case of a multichannel
square well plus an exponential potential in one of the channels. The solution
is obtained by summing exactly the infinite terms of the perturbative series
for the evolution operator of the system. Analytical expressions for the
scattering matrix and the scattering length are given, a Deser-like formula
which connects approximate ground energies and scattering length is obtained
for a particular case. Possible physical applications of these results are
discussed briefly.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs