MUONS

Set to 2 different clues across 2 published puzzles, most often “Catalyzing subatomic particles” — The New York Times, Thursday, 3 November 2005.

5 letters

Every clue on record, most used first

Catalyzing subatomic particlesonce
The New York Times — Thursday, 3 November 2005
Charge leptonsonce
The New York Times — Wednesday, 5 April 1995