The isotopic composition of galactic cosmic-ray lithium, beryllium, and boron

Details The isotopic composition of galactic cosmic-ray lithium, beryllium, and boron The isotopic composition of galactic cosmic-ray lithium, beryllium, and boron

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201l.145g&link_type=abstract

Astrophysical Journal, vol. 201, Nov. 1, 1975, pt. 2, p. L145-L148.

Astronomy and Astrophysics

Astronomy

43

Abundance, Beryllium Isotopes, Boron Isotopes, Cosmic Rays, Lithium Isotopes, Spaceborne Astronomy, Astronomical Models, Imp, Isotope Effect, Mean Free Path, Solar Activity Effects, Steady State

Scientific paper

The isotopes of cosmic-ray Li, Be, and B near 100 MeV per nucleon have been measured with cosmic-ray telescopes on board the IMP-7 and IMP-8 satellites during 1973 and 1974. The measured isotopic abundances provide a stringent test for models of interstellar propagation and solar modulation. It is found that the isotopic abundances can be explained using a steady-state interstellar propagation model with a 5-g/sq cm leakage mean free path. These results, taken along with Be-10 abundance measurements, indicate a longer lifetime for cosmic rays than that predicted by the usual assumption of an average interstellar density of 1 to 3 atoms per cu cm.

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