Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande

Details Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande

2011-07-29

arxiv.org/abs/1107.5885v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 5 figures, accepted by PRL, published October, 7th, 2011

Scientific paper

We report the observation of a steepening in the cosmic ray energy spectrum of heavy primary particles at about $8 \times 10^{16}$ eV. This structure is also seen in the all-particle energy spectrum, but is less significant. Whereas the `knee' of the cosmic ray spectrum at $3-5 \times 10^{15}$ eV was assigned to light primary masses by the KASCADE experiment, the new structure found by the KASCADE-Grande experiment is caused by heavy primaries. The result is obtained by independent measurements of the charged particle and muon components of the secondary particles of extensive air showers in the primary energy range of $10^{16}$ to $10^{18}$ eV. The data are analyzed on a single-event basis taking into account also the correlation of the two observables.

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