Assertion: positron | /r/HasProperty | stable
Facets:
value: due to the lepton number conservation
type: CAUSE
value: in each case
type: TEMPORAL
value: in itself
type: OTHER
Source sentences:
text: The positron is stable, but it exists in matter for only a short time because it undergoes annihilation with electrons.
text: The positron is stable, but it exists in matter for only a short time because it undergoes annihilation with electrons.
text: The positron is stable, but it exists in matter for only a short time because it undergoes annihilation with electrons.
text: The positron is stable, but it exists in matter for only a short time because it undergoes annihilation with electrons.
text: The reverse reaction also takes place: While in itself the electron and positron are stable in each case due to the lepton number conservation or the electric charge conservation, they annihilate each other when coming together within nanoseconds ( annihilation) and leave - in the form of suitable other elementary - nothing but her entire energy content, ie at least 1.02 MeV, as well as - if not