The abundance of nuclei from sodium to silicon in cosmic rays

Details The abundance of nuclei from sodium to silicon in cosmic rays The abundance of nuclei from sodium to silicon in cosmic rays

Sep 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974stin...7518150a&link_type=abstract

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Physics

Nuclear Physics

Cosmic Rays, Radiation Sources, Silicon, Sodium, Aluminum 26, Charge Distribution, Chronology, Ionization Cross Sections, Magnesium, Mean Free Path, Nuclei (Nuclear Physics), Transport Theory

Scientific paper

The expected charge spectrum at the top of the atmosphere was calculated for the charge interval Z between 11 abd 14. The calculations were based on the assumption that cosmic ray particles are selected by an ionization process from matter having 'normal' composition. The ratios Na/Mg, Al/Si, and (Na+Al)/(Mg+Si) were studied as a function of the amount of matter passed for different transport models and compared with experimental results. If the transport takes place at the constant energy E=800 MeV/n, the comparisons indicate a path length of about 4 g/sq cm for a slab model and a mean path length larger than or equal to 5 g/sq cm for an exponential model. The possibilities of using Aluminum 26 to determine the age of cosmic rays are discussed.

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