Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: KASCADE-Grande measurements of energy spectra for elemental groups of
  cosmic rays   The KASCADE-Grande air shower experiment [W. Apel, et al. (KASCADE-Grande
collaboration), Nucl. Instrum. Methods A 620 (2010) 202] consists of, among
others, a large scintillator array for measurements of charged particles, Nch,
and of an array of shielded scintillation counters used for muon counting, Nmu.
KASCADE-Grande is optimized for cosmic ray measurements in the energy range 10
PeV to about 2000 PeV, where exploring the composition is of fundamental
importance for understanding the transition from galactic to extragalactic
origin of cosmic rays. Following earlier studies of the all-particle and the
elemental spectra reconstructed in the knee energy range from KASCADE data [T.
Antoni, et al. (KASCADE collaboration), Astropart. Phys. 24 (2005) 1], we have
now extended these measurements to beyond 200 PeV. By analysing the
two-dimensional shower size spectrum Nch vs. Nmu for nearly vertical events, we
reconstruct the energy spectra of different mass groups by means of unfolding
methods over an energy range where the detector is fully efficient. The
procedure and its results, which are derived based on the hadronic interaction
model QGSJET-II-02 and which yield a strong indication for a dominance of heavy
mass groups in the covered energy range and for a knee-like structure in the
iron spectrum at around 80 PeV, are presented. This confirms and further
refines the results obtained by other analyses of KASCADE-Grande data, which
already gave evidence for a knee-like structure in the heavy component of
cosmic rays at about 80 PeV [W. Apel, et al. (KASCADE-Grande collaboration),
Phys. Rev. Lett. 107 (2011) 171104].

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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: physics
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th