The isotopic composition of galactic cosmic ray Li, Be, and B

Details The isotopic composition of galactic cosmic ray Li, Be, and B The isotopic composition of galactic cosmic ray Li, Be, and B

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....1..325g&link_type=abstract

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

Physics

1

Abundance, Cosmic Rays, Galactic Radiation, Isotope Effect, Beryllium Isotopes, Boron Isotopes, Carbon Isotopes, Explorer 47 Satellite, Explorer 50 Satellite, Isotope Separation, Lithium Isotopes, Nitrogen Isotopes, Oxygen Isotopes, Tables (Data)

Scientific paper

New measurements are reported of the isotopes of cosmic-ray Li, Be, and B and of the elements C, N, and O, with cosmic ray telescopes on board the IMP-7 and IMP-8 satellites during 1973-74 in the energy range 35-210 MeV/nucleon. High mass resolution and stability together with a set of data more extensive than in previous experiments lead to a clear isotopic separation. The measured isotopic and chemical abundances provide a stringent test for models of interstellar propagation and solar modulation. We find not only that for a steady state propagation and solar modulation model all light isotopes and medium element abundances are explained by 5 g/sq cm average pathlengths, as was earlier found from element analysis, but that also these results, taken along with our Be-10 measurements, indicate a longer lifetime for cosmic rays than predicted by the usual assumption of an average interstellar density of 1 to 3 atoms/cu cm.

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