Relativistic Be-7 - A probe of cosmic-ray acceleration

Details Relativistic Be-7 - A probe of cosmic-ray acceleration Relativistic Be-7 - A probe of cosmic-ray acceleration

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phrvl..41..594b&link_type=abstract

Physical Review Letters, vol. 41, Aug. 21, 1978, p. 594-597. Research supported by the U.S. Department of Energy;

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Beryllium 7, Particle Acceleration, Primary Cosmic Rays, Relativistic Particles, Balloon Sounding, Interstellar Space, Kinetic Energy, Magnetic Spectroscopy, Spallation

Scientific paper

The cosmic-ray Be-7/Be ratio was observed to be 0.6 below 500 MeV/nucleon, as expected from spallation reactions, but then to drop sharply to 0.4 by 1500 MeV/nucleon. This measurement suggests that primary cosmic rays traverse some material at their sources, producing Be-7 which picks up electrons and decays by K capture during or after the acceleration to relativistic energies. All cosmic rays then enter interstellar space, where further pickup is negligible.

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