Nuclear fragmentation parameters needed for interpretation of observed fluxes of UH cosmic ray nuclei

Details Nuclear fragmentation parameters needed for interpretation of observed fluxes of UH cosmic ray nuclei Nuclear fragmentation parameters needed for interpretation of observed fluxes of UH cosmic ray nuclei

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...39w&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 6, p. (6)39-(6)48

Physics

3

Abundance, Cosmic Rays, Energy Distribution, Flux (Rate), Fragmentation, Heavy Nuclei, Nuclear Interactions, Ionization Cross Sections, Particle Acceleration, Particle Tracks, Propagation, Radiation Counters

Scientific paper

Any study of the origin of the UH nuclei in the cosmic rays requires that their observed abundances be propagated back to the source. This demands a knowledge of the interaction cross sections in the materials of the detectors, any local overlying matter, and the interstellar medium. New measurements of interaction probabilities of 10.6 GeV/n gold nuclei show significant differences from previous measurements made at less than 1.0 GeV/n nuclei. These differences are particularly marked for a hydrogen target. Hence, those cross sections previously measured at low energies should not be applied to cosmic ray observations made at energies greater than or = 2 GeV/n. Without a measurement of the energy dependence of these cross sections it will be difficult to make reliable propagation calculations, since the differences between measured and predicted cross sections are still at the 20 to 30% level.

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