Energy spectra of cosmic ray nuclei: 4z26 and .3E2 GeV/amu

Physics – Nuclear Physics

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Cerenkov Counters, Chemical Composition, Cosmic Rays, Energy Spectra, Charge Distribution, Nuclei (Nuclear Physics), Primary Cosmic Rays, Secondary Cosmic Rays

Scientific paper

Energy spectra of cosmic ray nuclei in the charge range 5 is less than or equal to z less than or equal to 26 have been derived from the response of an acrylic plastic Cerenkov detector. Data were obtained using a balloon borne detector and cover the energy range 320 is approximately less than e approximately less than 2200 MeV. amu. Spectra are derived from a formal deconvolution using the method of Lezniak (1975). Relative spectra of different elements are compared by observing charge ratios. Secondary primary ratios are observed to decrease with increasing energy, consistent with the effect previously observed at higher energy. Primary to primary ratios are constant for 6 is less than or equal to z less than or equal to 26 and 14 is less than or equal to z less than or equal to 26 but vary for 10 is less than or equal to z less than or equal to 14. This data is found to be consistent with existing data where comparable and lends strong support ot the idea of two separate source populations contributing to the cosmic ray composition.

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