A New Measurement of Cosmic Ray Composition at the Knee

Details A New Measurement of Cosmic Ray Composition at the Knee A New Measurement of Cosmic Ray Composition at the Knee

1997-10-15

arxiv.org/abs/astro-ph/9710168v1

Astrophys.J. 491 (1997) L35-L38

Astronomy and Astrophysics

Astrophysics

7 pages, LaTeX, two eps figures, aas2pp4.sty and epsf.sty included, accepted by Ap.J. Lett

Scientific paper

10.1086/311049

The Dual Imaging Cerenkov Experiment (DICE) was designed and operated for making elemental composition measurements of cosmic rays near the knee of the spectrum at several PeV. Here we present the first results using this experiment from the measurement of the average location of the depth of shower maximum, , in the atmosphere as a function of particle energy. The value of near the instrument threshold of ~0.1 PeV is consistent with expectations from previous direct measurements. At higher energies there is little change in composition up to ~5 PeV. Above this energy is deeper than expected for a constant elemental composition implying the overall elemental composition is becoming lighter above the knee region. These results disagree with the idea that cosmic rays should become on average heavier above the knee. Instead they suggest a transition to a qualitatively different population of particles above 5 PeV.

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