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出典:Wiktionary
出典:『Wiktionary』 (2026/05/17 22:52 UTC 版)
出典:Wikipedia
出典:『Wikipedia』 (2011/05/23 07:49 UTC 版)
In particle physics, a pion (short for pi meson, denoted with π) is any of three subatomic particles: π0
, π+
, and π−
. Pions are the lightest mesons and they play an important role in explaining the low-energy properties of the strong nuclear force.