Unstable subatomic particle

This time we are looking on the crossword clue for: Unstable subatomic particle.
it’s A 27 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: MUON, KAON.

Last seen on: –The Washington Post Crossword – Jan 17 2021
NY Times Crossword 22 Feb 20, Saturday
Wall Street Journal Crossword – November 26 2019 – Bottom Feeders