Elemental abundance of high energy cosmic rays

Very high energy spectra of cosmic ray nuclei from the JACEE balloon experiments are presented. From a total of 12 balloon flights with an exposure factor of about 580 m 2 hour the energy spectra of nuclei have been obtained in the energy range from several TeV to 1,000 TeV. Proton energy spectrum,...

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Bibliographic Details
Published in:Nuclear physics. Section B, Proceedings supplement Proceedings supplement, 1998, Vol.60 (3), p.83-92
Main Author: Takahashi, Yoshiyuki
Format: Article
Language:English
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Summary:Very high energy spectra of cosmic ray nuclei from the JACEE balloon experiments are presented. From a total of 12 balloon flights with an exposure factor of about 580 m 2 hour the energy spectra of nuclei have been obtained in the energy range from several TeV to 1,000 TeV. Proton energy spectrum, extending to several hundred TeV, can be a single-power law. Helium shows a single power law spectrum in the energy range from 2 TeV/n to 200 TeV/n. Other nuclei up to Fe indicated harder spectral indices compared with those of protons and helium. The composition at around 500 TeV is 16 ± 5%: 29 ± 5%: 35 ± 5%: 9 ± 3%: 11 ± 4%, for the abundance of p : He : C ∼ O : Ne ∼ S : Z ≥ 18.
ISSN:0920-5632
1873-3832
DOI:10.1016/S0920-5632(97)00503-3