Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density of states and reflectionless tunneling in NS junction with a
  barrier   The effect of the barrier on the proximity effect in normal-superconductor
junction is analyzed. A general criterion for the barrier, though large, to be
effectively transparent, is given. This criterion is applied to both the
conductance of a disordered NS junction (reflectionless tunneling) and the
density of states across it, showing that both phenomena stem from the same
physical effect.

19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph