Direct experimental evidence for very long fission times of super-heavy elements

摘要

The blocking technique in single crystals has been applied to reaction time measurements for the 238U+Ge system at 6.1 MeVucleon. Backed up with a reaction mechanism analysis using the INDRA 4π detector, it provides a direct experimental evidence for Z = 124 compound nuclei living longer than 1018 s, indicating thus very high fission barriers for this element.