Assertion: fission | /r/AtLocation | case
Facets:
value: spontaneously
type: MANNER
value: in some heavy atoms
type: OTHER
Source sentences:
text: Fission can occur spontaneously in some cases in some heavy atoms.
text: Nuclear fission can occur spontaneously in some cases or can be induced by the bombardment on the nucleus with a variety of particles (e.g., protons, or neutrons or alpha particles) or by gamma rays radiation.