The Relative Abundance of the Isotopes of Li, Be and B and the Age of Cosmic Rays

Details The Relative Abundance of the Isotopes of Li, Be and B and the Age of Cosmic Rays The Relative Abundance of the Isotopes of Li, Be and B and the Age of Cosmic Rays

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..24...17w&link_type=abstract

Astrophysics and Space Science, Volume 24, Issue 1, pp.17-29

Astronomy and Astrophysics

Astrophysics

31

Scientific paper

Using a balloon borne double dE/dx x total energy telescope we have determined the isotopic composition of cosmic ray Li, Be and B nuclei in the energy range 100 250 MeV nuc.-1. The measured mass resolution, σ for these nuclei is ˜0.3 AMU. The observed isotopic composition is in agreement with that predicted on the basis of interstellar fragmentation with the exception of a deficiency of Be10. If the low abundance of Be10 is attributed to the decay of this radioactive isotope we obtain a mean cosmic ray lifetime of (3.4{-1.3/+3.4})×106 yr.

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