Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Incoherent Photoproduction of $\eta$-mesons from the Deuteron near
  Threshold   Incoherent photoproduction of the $\eta$-meson on the deuteron is studied for
photon energies from threshold to 800 MeV. The dominant contribution, the
$\gamma$N-$\eta$N amplitude, is described within an isobar model. The final
state interaction derived from the CD-Bonn potential is included and found to
be important for the description of the production cross section close to
threshold. Possible effects from the $\eta N$ final state interaction are
discussed.

35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con