Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The field of view of a scintillator pair for cosmic rays   Particles in an extended air shower (EAS), initiated by a cosmic ray primary,
lead to two nearly simultaneous detections in a scintillator pair. The angle of
the EAS and the axis through both scintillators can be reconstructed using the
time difference of the detections and the distance between the scintillators.
The acceptances of a scintillator along the axis through the scintillators and
perpendicularly on this axis follow the same distribution in theory. Using a
data set with two perpendicular detector pairs this theory is verified. The
distribution of possible origins of cosmic ray primaries, and the resulting
EAS, can thus be described using the perpendicular distribution for a given
time difference.

3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th