Abstract
A STACK of track-recording plastic detectors was exposed outside the Apollo 16 lunar module so that we could study the chemical Composition, energy spectra and origin of interplanetary heavy ions with 0.2≲E≲150 MeV/nucleon. The relative abundances of secondary nuclei such as LiBeB and the elements 17≤Z≤25 as a function of energy should be directly related to the galactic cosmic ray contribution because they are extremely rare in the Sun and in solar flare particles.
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