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results on the energy dependence of cosmic-ray charge compositionResults of measurements by a balloon-borne ionization spectrometer of the energy dependence of high-energy cosmic-ray charge composition. The results presented are greatly improved over those obtained earlier by Ormes et al. (1971) by the use of a multidimensional charge analysis with more efficient background rejection, and a more accurate energy determination. Complex couplings between the charge, energy, and trajectory information were taken into account and are discussed. The spectra of individual elements up to oxygen and of groups of nuclei up through iron were measured up to almost 100 GeV per nucleon. The energy spectrum of the secondary nuclei, B + N, is found to be steeper than that of the primary nuclei, C + O, in agreement with Smith et al. (1973). The most dramatic finding is that the spectrum of the iron nuclei is flatter than that of the carbon and oxygen nuclei by 0.57 plus or minus 0.14 of a power.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Balasubrahmanyan, V. K.
Ormes, J. F.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
November 15, 1973
Publication Information
Publication: Astrophysical Journal
Volume: 186
Subject Category
Distribution Limits