Measurement of the Isotopic Composition of the Iron-Group Elements in the Galactic Cosmic Radiation

Abstract
With an average σ0.65 amu we have measured the isotopic composition of Cr, Mn, Fe, and Ni in the galactic cosmic radiation for energies ∼300 to ∼600 MeV/amu at the detector. Large deviations from solar-system source composition reported by other workers are not observed.