Cosmic-Ray Proton and Helium Spectra: Results from the JACEE Experiment

Details Cosmic-Ray Proton and Helium Spectra: Results from the JACEE Experiment Cosmic-Ray Proton and Helium Spectra: Results from the JACEE Experiment

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...502..278a&link_type=abstract

Astrophysical Journal v.502, p.278

Astronomy and Astrophysics

Astronomy

195

Acceleration Of Particles, Balloons, Ism: Cosmic Rays

Scientific paper

Measurements of the cosmic-ray hydrogen and helium spectra at energies from 20 to 800 TeV are presented. The experiments were performed on a series of twelve balloon flights, including several long duration Australia to South America and Antarctic circumpolar flights. No clear evidence is seen for a spectral break. Both the hydrogen and the 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. The results are fully consistent with expectations based on supernova shock acceleration coupled with a "leaky box" model of propagation through the Galaxy.

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