Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pion and Eta Photoproduction in Nuclei   We calculate the quasifree photoproduction of pions and eta mesons on nuclei
from 12C to 208Pb. Assuming that for the quasifree process the cross sections
for pi/eta - photoproduction on a nucleon in medium are -- besides a lowering
due to Pauli blocking -- identical to those on a free nucleon, we use these as
an input. The produced mesons or resonances then propagate through the nucleus
where they can undergo several scattering and absorption processes. This final
state interaction, which leads to a lowering of the initial meson yield up to
70%, we simulate in a coupled channel Boltzmann-Uehling-Uhlenbeck transport
model. It allows us to study in detail the influence of Fermi motion, Pauli
blocking and of the additional decay channels for nucleon resonances in medium
on the photoproduction cross section. The calculated total and differential
cross sections are compared to experimental data and the influence of the
different medium effects on the cross sections is discussed in detail.

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The categories of this paper are: q-alg
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: econ
2
The categories of this paper are: math