Direct measurement of the composition and spectra of cosmic rays above 1 TeV/amu from Jacee

Authors

T. A. Parnell, NASA Marshall Space Flight Center
T. H. Burnett, University of Washington
S. Dake, Kobe University
J. H. Derrickson, NASA Marshall Space Flight Center
W. F. Fountain, NASA Marshall Space Flight Center
M. Fuki, Matsusho Gakuen Junior College
J. C. Gregory, The University of Alabama in Huntsville
T. Hayashi, The University of Alabama in Huntsville
R. Holynski, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
J. Iwai, University of Washington
W. V. Jones, Louisiana State University
A. Jurak, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
J. J. Lord, University of Washington
O. Miyamura, Osaka University
H. Oda, Kobe University
T. Ogata, The University of Tokyo
F. E. Roberts, The University of Tokyo
S. Strausz, University of Washington
T. Tabuki, NASA Marshall Space Flight Center
Y. Takahashi, The University of Alabama in Huntsville
T. Tominaga, Osaka University
J. W. Watts, NASA Marshall Space Flight Center
J. P. Wefel, Louisiana State University
B. Wilczynska, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
H. Wilczynski, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
R. J. Wilkes, University of Washington
W. Wolter, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
B. Wosiek, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences

Document Type

Article

Publication Date

1-1-1989

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. © 1989.

Publication Source (Journal or Book title)

Advances in Space Research

First Page

45

Last Page

54

Recommended Citation

Parnell, T., Burnett, T., Dake, S., Derrickson, J., Fountain, W., Fuki, M., Gregory, J., Hayashi, T., Holynski, R., Iwai, J., Jones, W., Jurak, A., Lord, J., Miyamura, O., Oda, H., Ogata, T., Roberts, F., Strausz, S., Tabuki, T., Takahashi, Y., Tominaga, T., Watts, J., Wefel, J., Wilczynska, B., Wilczynski, H., Wilkes, R., Wolter, W., & Wosiek, B. (1989). Direct measurement of the composition and spectra of cosmic rays above 1 TeV/amu from Jacee. Advances in Space Research, 9 (12), 45-54. https://doi.org/10.1016/0273-1177(89)90307-4