Energy Spectrum of Nuclei withZ>~60as Evidence for a New Source of Cosmic Rays

We have found the energy spectrum of cosmic rays with $Z>~60$ to be much steeper in the neighborhood of 1 GeV/amu than measured spectra of less massive cosmic rays. The data analysis includes effects due to solar modulation. This low-energy enhancement of high-$Z$ primaries implies sources which either are strongly enriched in very heavy elements or have a $Z$-dependent acceleration mechanism.