The elemental and isotopic composition of cosmic rays - Silicon to nickel

Details The elemental and isotopic composition of cosmic rays - Silicon to nickel The elemental and isotopic composition of cosmic rays - Silicon to nickel

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246.1014y&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 1014-1030.

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Abundance, Cosmic Rays, Heavy Nuclei, Radioactive Isotopes, Argon, Balloon Sounding, Balloon-Borne Instruments, Calcium, Iron, Nickel, Silicon, Sulfur

Scientific paper

The reported observations were made with the aid of the Cosmic Ray Isotope Instrument System (CRISIS) which had been designed to detect and resolve the isotopes of cosmic ray nuclei with atomic numbers equal to or greater than 10. The CRISIS detector was flown on a balloon launched from Aberdeen, South Dakota on 1977 May 20. The period 1977 May 19-22 has been classified by Mason et al. (1979) as one of 'superquiet' solar activity, characterized by the lowest fluxes of low-energy solar particles ever observed. The obtained results are presented in a number of graphs and tables. It was found that the elemental and isotopic abundances of Si are solar-like. Elemental S is underabundant in the cosmic rays by a factor of approximately 3 relative to the solar system, but its isotopic composition resembles the solar composition with S-32 being the dominant isotope. Elemental Ar is virtually absent in the source, and the observed isotopic composition is consistent with a secondary origin. Elemental Ni has a solar-like abundance.

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