Abstract
The exotic nuclear decay of ${}^{230}\mathrm{U}$ by emission of heavy ions has been investigated by use of ${}^{230}\mathrm{Pa}$ $\stackrel{{\ensuremath{\beta}}^{\ensuremath{-}}}{\ensuremath{\rightarrow}}$ ${}^{230}\mathrm{U}$ sources and polyester track detectors. After a run of 248 d, two cases of decay via heavy ion emission, which were most probably for the neon decays of ${}^{230}\mathrm{U},$ were observed for the first time. The preliminary branching ratio for the emission of heavy ions relative to $\ensuremath{\alpha}$ particles from ${}^{230}\mathrm{U}$ comes out to be $(1.3\ifmmode\pm\else\textpm\fi{}0.8)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}.$
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