| Subject | 
is not accelerated by | 
is a kind of | 
has quantum behavior | 
has number of quark | 
is an instance of | 
has spin | 
has synonym | 
has mass | 
has decay product | 
has definition | 
has charge | 
has lifetime | 
| neutral particle | electric or magnetic fields | particle |   |   |   |   |   |   |   | A particle with zero charge | 0 |   | 
| pion |   | charge multiplet | Bose-Einstein statistics | 2 |   | -has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press | π-meson | 270 me |   | An unstable nuclear particle of mass intermediate between that of a proton and an electron. The pions are believed to be the particles exchanged by nucleons, resulting in the strong nuclear force; they play a role in the strong interactions analogous to that of the photons in electromagnetic interactions. |   | -has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press | 
| pi0 | electric or magnetic fields |   | Bose-Einstein statistics | 2 | neutral particle | -has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press | π-meson | 264 me | two γ-rays |   | 0 | -has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press |