Enter a clue or pattern or both:
The Clue
Particle created by a cosmic ray (4 letter answer)
The Answer
MUON
Tags
Notes
The answer MUON is rarely seen, appearing only about once every 1100 puzzles.
Related Clues
Atomic particle
Elementary particle
Physics particle
Subatomic particle
Unstable lepton
Unstable particle
Definition
MUON as a noun:
1. (muon, negative muon, mu-meson) = an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino