Isotopic composition of primary cosmic-ray nitrogen and oxygen with consequences for source models

Details Isotopic composition of primary cosmic-ray nitrogen and oxygen with consequences for source models Isotopic composition of primary cosmic-ray nitrogen and oxygen with consequences for source models

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..63..215j&link_type=abstract

Astrophysics and Space Science, vol. 63, no. 1, June 1979, p. 215-236. Research supported by the Statens Naturvetenskapeiga For

Astronomy and Astrophysics

Astrophysics

2

Atmospheric Models, Chemical Composition, Isotopes, Mass Ratios, Nitrogen, Oxygen, Primary Cosmic Rays, Abundance, Astronomical Models, Balloon Flight, Calibrating, Error Analysis, Mass Spectra

Scientific paper

The paper reports measurements of the isotopic composition of cosmic-ray nitrogen and oxygen in a stack of nuclear emulsions, which was exposed to the primary radiation in a high-altitude balloon flight in northern Canada. The exposure, the detector stack and the method of mass measurements are described. The mass resolution and the method of calibrating the nitrogen mass scale are discussed. The nitrogen quotient extrapolated to the cosmic-ray source shows that the nitrogen-oxygen abundance ratio is approximately the same in the source as in the solar system. It is hypothesized that the radiation originates in a source having approximately the composition of the solar system and that a preferential selection mechanism, which depends on the atomic properties of the elements, is working in the source when the cosmic-ray nuclei are selected.

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