Assertion: muon's charge | /r/CapableOf | decrease over time
Facets:
value: due to the random decays of muons
type: CAUSE
Source sentences:
text: Since the charge of the injected beams decreases over time due to the random decays of muons, superconducting magnets with the highest possible field are needed to minimise the ring circumference and thus maximise the average number of collisions.