Energy spectrum of cosmic-ray iron nucleus observed with emulsion chambers

Physics – Nuclear Physics

Scientific paper

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Cosmic Rays, Energy Spectra, Iron, Nuclear Emulsions, Nuclei (Nuclear Physics), Balloon-Borne Instruments, Calibrating

Scientific paper

Energy spectrum of cosmic-ray Fe-nucleus has been measured from 4 GeV/n to beyond 100 GeV/n. The data were obtained using emulsion chambers exposed by a balloon launched from Sanriku, Japan. The energy of Fe nuclei was estimated by the opening angle method, the calibration of which was made using accelerator beams of 1.88 GeV/n Fe. The spectral index of Fe obtained is -2.45 + or - 0.04 in the range from 10 to 200 GeV/n, confirming the previous results obtained by different methods and proving the powerfulness of the opening angle method for cosmic rays.

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