Primary cosmic-ray nucleon spectrum in the energy range 40 400 TeV reconstructed from the secondary gamma-ray spectrum in the stratosphere

Details Primary cosmic-ray nucleon spectrum in the energy range 40 400 TeV reconstructed from the secondary gamma-ray spectrum in the stratosphere Primary cosmic-ray nucleon spectrum in the energy range 40 400 TeV reconstructed from the secondary gamma-ray spectrum in the stratosphere

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007astl...33..729d&link_type=abstract

Astronomy Letters, Volume 33, Issue 11, pp.729-735

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the spectrum of all primary cosmic-ray nucleons in the energy range 40 400 TeV reconstructed from the spectra of gamma rays recorded along with charged particles at an altitude of 30 km in the stratosphere in the RUNJOB balloon experiment. Gamma rays are produced by the interaction of primary cosmic-ray particles with atomic nuclei of the residual atmosphere and are a component whose spectrum follows the nucleon spectrum at the atmospheric boundary in the approximation of quasi-scaling models. Comparison of the nucleon spectrum with the proton spectrum indicates that the contribution of nucleons from nuclei increases toward the 100-TeV energy region compared to the 1-TeV region. This result confirms the conclusions reached in the JACEE, SOKOL, ATIC-2, and KASCADE experiments: the fraction of helium nuclei and, possibly, heavier nuclei in the primary cosmic-ray flux increases with energy.

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