|
|||||
|
|
Direct measurement of the composition and spectra of cosmic rays above 1 TeV/amu from Jacee |
|
| Authors: | T A Parnell T H Burnett S Dake J H Derrickson W F Fountain M Fuki J C Gregory T Hayashi R Holynski J Iwai W V Jones A Jurak J J Lord O Miyamura H Oda T Ogata F E Roberts S Strausz T Tabuki Y Takahashi T Tominaga J W Watts J P Wefel B Wilczynska H Wilczynski R J Wilkes W Wolter B Wosiek |
| Institution: | 1 Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188, Japan 2 Department of Physics, Kobe University, Kobe 657, Japan 3 Matsusho Gakuen Junior College, Matsumoto 390-12, Japan 4 Department of Applied Mathematics, Osaka University, Osaka 560, Japan 5 Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, U.S.A. 6 Space Science Laboratory, NASA/Marshall Space Flight Center, Huntsville, AL 35812, U.S.A. 7 School of Science, University of Alabama in Huntsville, Huntsville, AL 35899, U.S.A. 8 Department of Physics, University of Washington, Seattle, Washington 98195, U.S.A. 9 Institute of Nuclear Physics, 30-055, Krakow, Poland |
| Abstract: | Direct measurements on cosmic ray protons through iron above about 1 TeV/amu have been performed in a series of balloon-borne experiments with emulsion chambers. The measured energy spectra of protons and helium are power laws with exponents of 2.77 ± 0.09 and 2.72 ± 0.11 in the energy range 5 to 500 TeV and 2 to 50 TeV/amu, respectively. The proton spectrum shows no evidence of the steepening near 2 TeV which was reported by other experiments. Helium has a slightly higher intensity compared to extrapolations from lower energy measurements. The heavier elements, carbon to sulfur, show a small tendency for intensity enhancement in the relative abundance above 10 TeV/amu. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |