Carbonaceous chondrite fission Xe, often abbreviated as CCF Xe, are a collection of different isotopes of xenon that were thought to have arisen from the decay of a superheavy element within the island of stability.
By the 1980s, CCF Xe actually being the product of fission was doubtful, and the alternate theory that it had arisen from r-process (neutron capture) nucleosynthesis gained more ground [REF].