Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy Spectra of Abundant Cosmic-ray Nuclei in Sources, According to
  the ATIC Experiment   One of the main results of the ATIC (Advanced Thin Ionization Calorimeter)
experiment is a collection of energy spectra of abundant cosmic-ray nuclei:
protons, He, C, O, Ne, Mg, Si, Fe measured in terms of energy per particle in
the energy range from 50 GeV to tens of teraelectronvolts. In this paper, the
ATIC energy spectra of abundant primary nuclei are back-propagated to the
spectra in sources in terms of magnetic rigidity using a leaky-box
approximation of three different GALPROP-based diffusion models of propagation
that fit the latest B/C data of the AMS-02 experiment. It is shown that the
results of a comparison of the slopes of the spectra in sources are weakly
model dependent; therefore the differences of spectral indices are reliable
data. A regular growth of the steepness of spectra in sources in the range of
magnetic rigidity of 50--1350~GV is found for a charge range from helium to
iron. This conclusion is statistically reliable with significance better than
3.2 standard deviations. The results are discussed and compared to the data of
other modern experiments.

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The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
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The categories of this paper are: econ
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom