Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon-nucleon cross sections in neutron-rich matter   We calculate nucleon-nucleon cross sections in the nuclear medium with
unequal densities of protons and neutrons. We use the
Dirac-Brueckner-Hartree-Fock approach together with realistic nucleon-nucleon
potentials. We examine the effect of neutron/proton asymmetry and find that,
although generally mild, it can be significant in specific regions of the phase
space under consideration.

1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex