Assertion: hs's isotope | /r/HasProperty | observed on one occasion
Facets:
Source sentences:
text: An isotope assigned to 277Hs has been observed on one occasion decaying by SF with a long half-life of ~11 minutes.
text: An isotope assigned to 277Hs has been observed on one occasion decaying by spontaneous fission with a long half-life of ~11 minutes.