Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing Cold Dense Nuclear Matter   The protons and neutrons in a nucleus can form strongly correlated nucleon
pairs. Scattering experiments, where a proton is knocked-out of the nucleus
with high momentum transfer and high missing momentum, show that in 12C the
neutron-proton pairs are nearly twenty times as prevalent as proton-proton
pairs and, by inference, neutron-neutron pairs. This difference between the
types of pairs is due to the nature of the strong force and has implications
for understanding cold dense nuclear systems such as neutron stars.

14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom