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The Heavy Ions in Space (HIIS) experiment was developed at Naval Research Laboratory and is currently in orbit onboard NASA's Long Duration Exposure Facility (LDEF). HIIS will record relativistic cosmic ray nuclei heavier than magnesium and stopping nuclei down to helium.The experiment uses plastic track detectors that have a charge resolution of 0.15 charge units at krypton (Z=36) and 0.10 charge units, or better, for nuclei lighter than cobalt (Z=27).HIIS has a collecting power of 2 square meter steradians and it has already collected more than a year's data.

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