Detection of relativistic iron nuclei in the plastic track detector CR-39

Computer Science – Sound

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Balloon Sounding, Cosmic Rays, Heavy Nuclei, Iron, Particle Tracks, Relativistic Particles, Abundance, Allyl Compounds, Carbonates, Glycols, Nuclear Emulsions, Radiation Detectors

Scientific paper

The first positive detection of highly relativistic (not less than 7.5 GeV/n) cosmic ray iron nuclei, in the plastic CR-39 (Allyl Diglycol Carbonate), during a balloon flight made from Hyderabad, India, is reported. The high value of the local geomagnetic cut-off ensured the relativistic nature of the particles. Their charges were determined by measurements both in the plastic and an adjacent G5 nuclear emulsion, and from a knowledge of cosmic ray abundances. The charge detection threshold for CR-39 is obtained as Z = 20 for relativistic particles. The results are compared with those obtained by other workers, for the same plastic, employing heavy ion beams from accelerators.

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