Where is the Bend in the Cosmic Ray Proton Spectrum?

Details Where is the Bend in the Cosmic Ray Proton Spectrum? Where is the Bend in the Cosmic Ray Proton Spectrum?

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3..187c&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

The JACEE collaboration has recently presented measurements of the cosmic ray hydrogen and helium spectra with individual particle total energies from ~6 to 800 TeV (Asakimori et al., 1998). No clear evidence is seen for a spectral break. Both the hydrogen and helium spectra are consistent with power laws over the entire energy range, with integral spectral indices 1.80 ± 0.04 and 1.68 +0.04/-0.06 for the protons and helium respectively. With 644 m2-hrs of accumulated exposure (including the results from two >200 hr Antarctic flights), JACEE has measured 656 proton events above 6 TeV and 414 helium above 2 TeV/nucleon. The high-energy statistics are still limited, however: Although no break is visible, a likelihood analysis shows that there is no statistical evidence ruling out a break in the proton spectrum at energies above 40-90 TeV.

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