Physics – Nuclear Physics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.301...44s&link_type=abstract
Nature, vol. 301, Jan. 6, 1983, p. 44-46.
Physics
Nuclear Physics
12
Iron, Nuclei (Nuclear Physics), Particle Energy, Primary Cosmic Rays, Secondary Cosmic Rays, Energy Spectra, Kinetic Energy, Particle Acceleration, Radiation Counters
Scientific paper
It is pointed out that recent measurements of the charge and energy composition of cosmic rays have shown the energy spectra of secondary cosmic ray nuclei (Li, Be, B) to be steeper than those of the parent nuclei (C, O), indicating a decreasing path length for the particles with increasing energy. There are also differences in the energy spectra of primary nuclei, such as C, O and Fe. The spectrum of Fe above 100 GeV is of particular interest. The measurements that exist up to approximately 10 to the 13th eV indicate that the spectrum of Fe is less steep than that of lighter nuclei, including protons. It is noted that if the trend were to continue to energies above 10 to the 15th eV, then Fe would become the dominant constituent of cosmic rays. Even though this conclusion is supported by results from air shower measurements at primary energies above 10 to the 13th eV, air shower measurements suffer from the inherent uncertainty of having to extrapolate data from lower energy accelerator measurements for air shower modeling.
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