The relative abundances of galactic cosmic ray Be-7, Be-9, and Be-10

Details The relative abundances of galactic cosmic ray Be-7, Be-9, and Be-10 The relative abundances of galactic cosmic ray Be-7, Be-9, and Be-10

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....1..331g&link_type=abstract

In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 1. (A76-26851

Physics

4

Abundance, Beryllium Isotopes, Cosmic Rays, Explorer 47 Satellite, Explorer 50 Satellite, Galactic Radiation, Beryllium 10, Histograms, Particle Energy, Particle Telescopes

Scientific paper

The isotopic composition of galactic cosmic ray Be near 100 MeV/nucleon was measured in interplanetary space with high-resolution solid-state telescopes on the IMP-7 and IMP-8 satellites during 1973-1974. These two independent measurements yield Be-10/Be ratios above 10%. Taken together with the galactic propagation model described in the text, these results show that the cosmic ray 'clock' lifetime (most probable value of roughly 20 million years) is significantly greater than that deduced for a nominal interstellar gas density of about 1 to 3 atoms/cu cm.

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