Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atmospheric gamma-ray observation with the BETS detectorfor calibrating
  atmospheric neutrino flux calculations   We observed atmospheric gamma-rays around 10 GeV at balloon altitudes (15~25
km) and at a mountain (2770 m a.s.l). The observed results were compared with
Monte Carlo calculations to find that an interaction model (Lund Fritiof1.6)
used in an old neutrino flux calculation was not good enough for describing the
observed values. In stead, we found that two other nuclear interaction models,
Lund Fritiof7.02 and dpmjet3.03, gave much better agreement with the
observations. Our data will serve for examining nuclear interaction models and
for deriving a reliable absolute atmospheric neutrino flux in the GeV region.

20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph