Abstract
A stack of the plastic CR-39 and nuclear emulsions was exposed at a vertical cut-off rigidity of 10.3 GV and an atmospheric depth of 7 g/cm 2 for 30 h in May, 1979. Characteristics of shapes of etched cones produced by relativistic cosmic ray heavy nuclei in CR-39 are investigated and it is found that the surface ellipse of the etched track with large dip angle becomes more deformed. The detection threshold value is obtained to be Z/ β ≅ 6 and the charge resolution (root mean square) to be ΔZ ≅ 0.4 charge units for relativistic iron nuclei in CR-39.
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