Abstract
We report new measurements of the cosmic-ray elemental and isotopic composition of Fe, Co and Ni nuclei in the energy range from 110 to 298 MeV per nucleon. These measurements were made using the High Energy Telescope of the CRS experiment on the Voyager 1 and 2 spacecraft during the time period from 1977 to 1996. In this overall time period of 18 years the average solar modulation parameter Φ was about 480 MV. On the basis of the 2710 Fe events, 16 Co events and 135 Ni events observed we find that the isotopic composition for Fe, Co and Ni is consistent with a solar-like source composition. The isotopic composition of Co indicates that the time delay between nucleosynthesis and cosmic-ray acceleration is probably larger than a few x 10 4 yr.
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