Estimation of chemical abundance of primary cosmic-ray nuclei over Alice Springs using balloon-borne passive detectors

Computer Science

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Abundance, Balloon-Borne Instruments, Primary Cosmic Rays, Radiation Detectors, Alpha Particles, Australia, Heavy Nuclei

Scientific paper

A stack consisting of polymerlike Columbia resins (CR-39) doped with 0.5 percent hexachlorobutadiene nuclear emulsions and X-ray films was exposed to primary cosmic rays by a balloon launched from Alice Springs in 1983. The major and minor axes of the elliptic etch pits were analyzed. About 1112 elliptic etch pits were scanned. The measured integral flux of very heavy and Fe nuclei above 3.5 GeV/n are in approximate agreement with earlier surveys but yield a flatter energy spectrum when compared to a recent high-energy extrapolated spectrum. The charges of the detected heavy nuclei were also confirmed from delta-ray counting of heavily ionized tracks in nuclear emulsions. The energy of the incident heavy nuclei is measured from the distribution of opening angles of alpha fragments initiated by heavy nuclei in nuclear emulsions.

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