Computer Science
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ncimc..14..595b&link_type=abstract
Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 14 C, Nov.-Dec. 1991, p. 595-603.
Computer Science
4
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.
Basu Baidyanath
Bhattacharyya D. P.
Chakrabarty Somenath
Fujii Masaaki
Pal Pinaki
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