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The isotopic composition of galactic cosmic-ray lithium, beryllium, and boron (1975)

Garcia-Munoz, M. ; Simpson, J. A. ; Mason, G. M.

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Publication Date: 2019-06-27

Description: 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.

Keywords: SPACE RADIATION

Type: Astrophysical Journal; 201; Nov. 1

Format: text

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