Evidence for Changing of Cosmic Ray Composition between 10¹⁷ and 10¹⁸ eV from Multicomponent Measurements

Authors

T. Abu-Zayyad, The University of Utah
K. Belov, The University of Utah
D. J. Bird, The University of Adelaide
J. Boyer, Columbia University
Z. Cao, The University of Utah
M. Catanese, Smithsonian Astrophysical Observatory
G. F. Chen, The University of Utah
R. W. Clay, The University of Adelaide
C. E. Covault, The Enrico Fermi Institute
J. W. Cronin, The Enrico Fermi Institute
H. Y. Dai, The University of Utah
B. R. Dawson, The University of Adelaide
J. W. Elbert, The University of Utah
B. E. Fick, The Enrico Fermi Institute
L. F. Fortson, The Enrico Fermi Institute
J. W. Fowler, The Enrico Fermi Institute
K. G. Gibbs, The Enrico Fermi Institute
M. A.K. Glasmacher, University of Michigan, Ann Arbor
K. D. Green, The Enrico Fermi Institute
Y. Ho, Columbia University
A. Haung, The University of Utah
C. C. Jui, The University of Utah
M. J. Kidd, University of Illinois Urbana-Champaign
D. B. Kieda, The University of Utah
B. C. Knapp, Columbia University
S. Ko, The University of Utah
C. G. Larsen, The University of Utah
W. Lee, Columbia University
E. C. Loh, The University of Utah
E. J. Mannel, Columbia University
J. Matthews, Louisiana State University
J. N. Matthews, The University of Utah
B. J. Newport, The Enrico Fermi Institute

Document Type

Article

Publication Date

1-1-2000

Abstract

The average mass composition of cosmic rays with primary energies between 1017 and 1018eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the muon density as a function of energy. The results show that the composition is changing from a heavy to lighter mix as the energy increases. © 2000 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

First Page

4276

Last Page

4279

Recommended Citation

Abu-Zayyad, T., Belov, K., Bird, D., Boyer, J., Cao, Z., Catanese, M., Chen, G., Clay, R., Covault, C., Cronin, J., Dai, H., Dawson, B., Elbert, J., Fick, B., Fortson, L., Fowler, J., Gibbs, K., Glasmacher, M., Green, K., Ho, Y., Haung, A., Jui, C., Kidd, M., Kieda, D., Knapp, B., Ko, S., Larsen, C., Lee, W., Loh, E., Mannel, E., Matthews, J., Matthews, J., & Newport, B. (2000). Evidence for Changing of Cosmic Ray Composition between 10¹⁷ and 10¹⁸ eV from Multicomponent Measurements. Physical Review Letters, 84 (19), 4276-4279. https://doi.org/10.1103/PhysRevLett.84.4276