Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....2..158m&link_type=abstract
In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 2. (A81-12386 02-93) T
Physics
Abundance, Actinide Series, Chronometers, Cosmic Rays, Radiation Measurement, Radiative Lifetime, Decay Rates, Half Life, Heuristic Methods, Milky Way Galaxy, Radiant Flux Density, Radiation Counters, Radioactive Decay
Scientific paper
Measurements of ultraheavy cosmic rays will provide radioactive chronometers, including the actinides, which are expected to be present in the source. These primary chronometers differ from the Be-10 secondary chronometer in total inelastic cross-section and decay half-life. A propagation code, which includes nuclear fragmentation, radioactive decay, and ionization energy-loss of cosmic rays is being used to investigate the variations in the fluxes and mean ages which would be expected for various models of cosmic ray propagation. Some preliminary results in the actinide region are presented here which indicate that measurements of the relative abundances of the actinides in the cosmic rays will be very useful for understanding source abundances but less useful for studying propagation effects.
Bernard Blake J.
Margolis Steven H.
Schramm David N.
Wefel John P.
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