Chemical composition of the primary cosmic rays near the top of the atmosphere

Details Chemical composition of the primary cosmic rays near the top of the atmosphere Chemical composition of the primary cosmic rays near the top of the atmosphere

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ncimc..14...35b&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 14 C, Jan.-Feb. 1991, p. 35-40.

Computer Science

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Balloon Sounding, Chemical Composition, Particle Tracks, Primary Cosmic Rays, Radiation Measurement, Upper Atmosphere, Balloon-Borne Instruments, Emission Spectra, Heavy Ions, Ionization, Spectrum Analysis

Scientific paper

A stack of CR-39 (HCB 0.5 percent) passive solid-state nuclear track detectors was irradiated by primary cosmic rays near the top of the atmosphere. The stack of detectors were flown by balloons launched from Alice Springs, Australia in 1983. After 16h 41 min flight exposure at an atmospheric pressure of 9.5 mb the plates were collected and chemically etched in 6.7 N NaOH aqueous solution at 70 C for 27 hours. The diameter distribution of the 1208 etch pits caused by the presence of heavy ions in primary cosmic rays was measured by a transmitted light microscope having an objective x 10 and a x 15 filar micrometer eyepiece attachment. The diameter distribution was standardized and calibrated against the conventional cosmic-ray results found by Tasaka et al. The estimated charge spectrum is in accord with the nuclear emulsion data of Daniel and Durgaprasad, Kristiansson et al., Saito and Chohan et al.

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