Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Iron Spectrum in Cosmic Rays by VERITAS   We present a new measurement of the energy spectrum of iron nuclei in cosmic
rays from 20 to 500 TeV. The measurement makes use of a template-based analysis
method, which, for the first time, is applied to the energy reconstruction of
iron-induced air showers recorded by the VERITAS array of imaging atmospheric
Cherenkov telescopes. The event selection makes use of the direct Cherenkov
light which is emitted by charged particles before the first interaction, as
well as other parameters related to the shape of the recorded air shower
images. The measured spectrum is well described by a power law
$\frac{\mathrm{d} F}{\mathrm{d} E}=f_0\cdot
\left(\frac{E}{E_0}\right)^{-\gamma}$ over the full energy range, with $\gamma
= 2.82 \pm 0.30 \mathrm{(stat.)} ^{+0.24}_{-0.27} \mathrm{(syst.)}$ and $f_0 =
\left( 4.82 \pm 0.98 \mathrm{(stat.)}^{+2.12}_{-2.70} \mathrm{(syst.)}
\right)\cdot 10^{-7}$m$^{-2}$s$^{-1}$sr$^{-1}$TeV$^{-1}$ at $E_0=50$TeV, with
no indication of a cutoff or spectral break. The measured differential flux is
compatible with previous results, with improved statistical uncertainty at the
highest energies.

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The categories of this paper are: solv-int
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
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The categories of this paper are: adap-org