Secular variations in the abundances of heavy nuclei in cosmic rays.

ABSTRACT

The ratios of fluxes of heavy cosmic-ray nuclei [(30 meteorites and lunar samples, show little variation with time, distance in the solar system (1 to 3 astronomical units), or kinetic energy (30 to 2000 megaelectron volts per nucleon). Samples exposed for time intervals of 10(3) to 10(8) years show that the variations in the flux of 30 iron group nuclei (20 < Z cosmic radiation.