Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron localization induced by the pairing field in an inhomogeneous
  neutron matter   It is shown that in an inhomogeneous neutron matter the pairing field bounds
neutrons around the Fermi level leading to the formation of localized Andreev
states. In the case of the inner crust of neutron stars the localization length
has been determined as a function of the nuclear density.

18
The categories of this paper are: econ
1
The categories of this paper are: cs
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th