Galactic cosmic ray iron composition

Details Galactic cosmic ray iron composition Galactic cosmic ray iron composition

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8226159s&link_type=abstract

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Computer Science

Cosmic Rays, Galactic Radiation, Iron Isotopes, Particle Tracks, Radiation Counters, Cellulose Nitrate, Dielectrics, Nuclear Emulsions, Solar System

Scientific paper

The isotopic composition of galactic cosmic ray iron was studied in the energy interval 500-750 MeV/nucleon with a visual track detector system consisting of nuclear emulsion and cellulose nitrate plastic. Stopping iron nuclei were identified from ionization range measurements in the two detector parts. Cone lengths were measured in the plastic sheets and the residual ranges of the particles were measured in plastic and in emulsion. The mass of iron-17 nuclei was determined with an uncertainty of about 0.3 amu. The isotopic composition at the detector level was found to be Fe-52:Fe-53:Fe-54:Fe-55:Fe-56:Fe-57:Fe-58 = 0:1:4:3:8:1:0. These numbers are not in conflict with the assumption that the isotopic composition of cosmic ray iron at the source is similar to the solar system composition.

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