Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232l..95g&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 232, Sept. 1, 1979, p. L95-L99.
Astronomy and Astrophysics
Astrophysics
31
Cosmic Rays, Explorer Satellites, Galactic Radiation, Neon Isotopes, Graphs (Charts), Histograms, Tables (Data)
Scientific paper
The paper examines the results obtained by the University of Chicago instrument on board the IMP 7 satellite used to measure the abundances of Ne-20 and Ne-22 in the galactic cosmic rays during 1973-1977, over the general energy range of 60-230 MeV per nucleon. It is reported that the instrument shows a mass resolution of 0.7 amu(sigma) which was confirmed by calibrating a backup instrument at the LBL Bevalac with separated beams of neon isotopes. Through the use of standard solar modulation and cosmic-ray propagation models, the cosmic-ray source ratio inferred is Ne-22/Ne-20 = 0.38 = or -0.07 which is significantly greater than the present solar system ratio. It is concluded that propagation effects or cross-section uncertainties cannot account for such a large abundance of Ne-22, and thus this measurement provides evidence that the cosmic rays come from a source region where the Ne-22 abundance is substantially greater than in solar system material.
Garcia-Munoz Manuel
Simpson André J.
Wefel John P.
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