Assertion: protactinium's isotope | /r/CapableOf | measure to be 0.17 ev.
Facets:
value: to be 8.28 ±
type: OTHER
value: recently
type: TEMPORAL
Source sentences:
text: One isotope, 229Th, has a nuclear isomer (or metastable state) with a remarkably low excitation energy, recently measured to be 8.28 ± 0.17 eV.