SP-466 The Star Splitters
 

Isotopic Composition of Primary Cosmic Rays Experiment, HEAO C-2.

Isotopic Composition of Primary Cosmic Rays Experiment, HEAO C-2. Flash tube arrays defined the trajectory of incident particles through the detectors, which were powder Cerenkov counters. The indices of refraction of the counters were chosen to maximize the useful observation time for the geomagnetic cutoff associated with the orbit of the observatory. This experiment measured the isotopic composition of primary cosmic rays with atomic charge z in the range of 4 (beryllium) to 56 (iron) and m the momentum range 2 to 20 billion electron volts per nucleon. In addition, the charge resolution of the instrument allowed identification of all incident nuclei up to charge z = 50 (tin).

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