Cosmic-ray proton and helium spectra: results from the Jacee experiment
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...
Published in: | The Astrophysical Journal |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Text |
Language: | unknown |
Published: |
LSU Scholarly Repository
1998
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Subjects: | |
Online Access: | https://repository.lsu.edu/physics_astronomy_pubs/5526 https://doi.org/10.1086/305882 |
Summary: | 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 1.68-0.06+0.04 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. © 1998. The American Astronomical Society. All rights reserved. |
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