Assertion: hs's isotope | /r/HasAspect | spontaneous fission
Facets:
Source sentences:
text: GSI's experiment to create element 108 was delayed until after their creation of element 109 in 1982, as prior calculations had suggested that even–even isotopes of element 108 would have spontaneous fission half-lives of less than one microsecond, making them difficult to detect and identify.