Light-fragment yield ratios from heavy-ion-induced fragmentation in atmospheric collisions of cosmic-ray primary nuclei

Details Light-fragment yield ratios from heavy-ion-induced fragmentation in atmospheric collisions of cosmic-ray primary nuclei Light-fragment yield ratios from heavy-ion-induced fragmentation in atmospheric collisions of cosmic-ray primary nuclei

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cajph..69.1481p&link_type=abstract

Canadian Journal of Physics (ISSN 0008-4204), vol. 69, Dec. 1991, p. 1481-1486.

Physics

1

Heavy Nuclei, Ionic Collisions, Secondary Cosmic Rays, Upper Atmosphere, Fragmentation, Helium Isotopes, Nuclear Interactions, Primary Cosmic Rays

Scientific paper

A statistical nuclear-fragmentation model is used to calculate the total inclusive cross sections and yield ratios of light fragments (p, d, H-3, and He-3) from 800 MeV/nucleon mass-symmetric and mass-asymmetric collision systems. Comparisons with available data reveal good correspondence between the observed total cross sections and fragment-yield ratios, and the calculated ones. The model is also used to calculate the He-4/He-3 ratio from CNO + CNO collisions at 1 GeV/nucleon. Averaging over the mass number of the CNO collision system, a ratio of 5.76 +/- 0.52 +/- 12 percent is calculated. A mass-independent thermal-model formula gives a ratio of only 1.5. The appreciable calculated production of He-4 relative to He-3 as fragmentation products in atmospheric CNO collisions with 1 GeV/nucleon cosmic-ray primary CNO nuclei, has important implications for studies of atmospheric secondaries as background sources for space-based and balloon-borne light-fragment observations.

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