Assertion: beta decay | /r/HasProperty | a nucleus decays
Facets:
value: sometimes
type: TEMPORAL
value: by emitting an electron
type: MANNER
value: spontaneously
type: MANNER
Source sentences:
text: Beta decay is when a nucleus decays spontaneously by emitting an electron or a positron.
text: Beta decay (sometimes called neutron decay) is a type of radioactive decay in which a β-particle or electron is emitted.