Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Explicit pionic degrees of freedom in deuteron photodisintegration in
  the Delta-resonance region   Photodisintegration of the deuteron above pi-threshold is studied in a
coupled channel approach including N-Delta- and pi-d-channels with pion
retardation in potentials and exchange currents.

30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph