Assertion: beta decay | /r/CapableOf | call a beta particle
Facets:
value: often
type: TEMPORAL
value: in this context
type: TEMPORAL
Source sentences:
text: Italian physicist Enrico Fermi devised a theory in 1933 to explain beta decay, which is the process by which a neutron in a nucleus changes into a proton and expels an electron, often called a beta particle in this context.