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Chemical composition of the primary cosmic rays near the top of the atmosphere
Authors:D. P. Bhattacharyya   P. Pal   B. Basu   S. C. Mukherjee   A. K. Ganguly  M. Fujii
Affiliation:(1) Department of Theoretical Physics, Indian Association for the Cultivation of Science Jadavpur, 700 032 Calcutta, India;(2) Department of Physics, University College of Science, 700 009 Calcutta, India;(3) The Institute of Space and Astronautical Sciences, 153 Tokyo, Japan
Abstract:Summary A stack of CR-39 (HCB 0.5%) passive solid-state nuclear track detectors were 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 16 h 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 Leitz Ortholux microscope having an objective×10 and a×15 filar micrometer eyepiece attachment. The diameter distribution was standardised and calibrated against the conventional cosmic-ray results found by Tasakaet al. The estimated charge spectrum is in accord with the nuclear emulsion data of Daniel and Durgaprasad, Kristianssonet al., Saito and Chohanet al.
Keywords:Cosmic-ray interactions with the Earth
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