The cosmic-ray age deduced from the Be-10 abundance

Details The cosmic-ray age deduced from the Be-10 abundance The cosmic-ray age deduced from the Be-10 abundance

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201l.141g&link_type=abstract

Astrophysical Journal, vol. 201, Nov. 1, 1975, pt. 2, p. L141-L144.

Astronomy and Astrophysics

Astrophysics

46

Abundance, Beryllium 10, Cosmic Rays, Galactic Radiation, Radioactive Age Determination, Astronomical Models, Gas Density, Interstellar Gas, Telescopes

Scientific paper

Satellite measurements of the radioactive cosmic-ray species Be-10 are reported. The abundance was measured near 100 MeV per nucleon with high-resolution solid-state telescopes on the IMP-7 and IMP-8 satellites during 1973 and 1974. These two independent measurements yield Be-10/Be ratios of less than 10 percent. Taken together with a galactic propagation model, these results show that the cosmic-ray 'clock' lifetime (most probable value of the order of 20 million years) is significantly greater than that deduced for a nominal interstellar gas density of the order of 1 to 3 atoms per cu cm.

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