High-Resolution Measurements of Slowing Cosmic Rays from Fe to U

Abstract
We have identified cosmic rays with Z=40,44,52,71,77,78, and 92 slowing in a balloon-borne stack. The values of Z assigned by both Lexan plastic detectors and nuclear emulsions were the same to within two units. Both low- and high-energy heavy cosmic rays are synthesized in the rapid neutron-capture process.

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