| Subject | 
is not accelerated by | 
is part of | 
is a kind of | 
has quantum behavior | 
has number of quark | 
is an instance of | 
has spin | 
has synonym | 
has discovery date | 
has mass | 
has decay product | 
has definition | 
has charge | 
has lifetime | 
has symbol | 
has antiparticle | 
has energy | 
has discoverer | 
has composition | 
is accelerated by | 
| antineutron | electric or magnetic fields |   |   | Fermi-Dirac statistics | 3 | radioactive particle | 1/2 or 3/2 |   |   |   | the products produced immediately after decay | The antiparticle of a neutron. A neutron and antineutron both have the same mass and zero electric charge, but can be differentiated by their interactions: a neutron and an antineutron can annihilate into gamma rays, while two neutrons cannot. | 0 | The average time in which a particle decays |   | neutron |   |   |   |   | 
| antiproton |   |   |   | Fermi-Dirac statistics | 3 | radioactive particle | 1/2 or 3/2 |   |   |   | the products produced immediately after decay | The antiparticle of a proton, identical in mass and spin but of opposite (negative) charge. | -1 | The average time in which a particle decays |   | proton |   |   |   | electric or magnetic fields | 
| cosmic rays |   |   | charged particle |   |   |   |   | corpuscular radiation |   |   | the products produced immediately after decay | High-energy charged particles which stream at relativistic velocities down to Earth from space. The Sun ejects low-energy (107 - 1010 eV) cosmic rays during solar flares (those of lower energy than this are unobservable from Earth because of solar system magnetic fields). Those of intermediate energy (1010 - 1016 eV) have an isotropic distribution, and are apparently produced in the Galaxy. Possible sources of acceleration are shock waves accompanying supernovae (although cosmic rays have a higher hydrogen content than would be expected from a star that has processed material to iron), and the rotating magnetic fields of pulsars. The light elements Li, Be, and B have a higher abundance ratio in cosmic rays than in the solar system. | non-zero | The average time in which a particle decays |   |   | 2 GeV (average) |   | 85% protons, 14% alpha-particles, 1% electrons, << 1% heavy nuclei | electric or magnetic fields | 
| hyperon |   |   | radioactive particle | Fermi-Dirac statistics | 3 |   | 1/2 or 3/2 |   |   |   | the products produced immediately after decay | Baryons heavier than the neutron (this term is seldom used today). They have non-zero strangeness. Free hyperons are unstable and decay into end products, one of which is a proton. |   | 10-8 to 10-10 seconds |   |   |   |   |   |   | 
| muon |   |   |   | Fermi-Dirac statistics |   | charged particle | 1/2 |   |   |   | the products produced immediately after decay | Elementary particles produced when cosmic rays enter the upper atmosphere. | -1 | The average time in which a particle decays | μ |   |   |   |   | electric or magnetic fields | 
| neutron | electric or magnetic fields | nucleus |   | Fermi-Dirac statistics | 3 | radioactive particle | 1/2 |   |   | 1.6749 × 10-24 g | proton, electron | Stable within the nucleus, the neutron if isolated decays, with a ha half-life of fifteen minutes. | 0 | 15 minutes |   |   |   |   | two down quarks and one up quark |   | 
| positron |   |   |   | Fermi-Dirac statistics |   | radioactive particle | 1/2 | antielectron | 1934 |   | the products produced immediately after decay | The antiparticle of the electron, discovered by Anderson in 1934. It has the same mass and spin as the electron, but opposite charge and magnetic moment. | 1 | The average time in which a particle decays |   | electron |   | Anderson |   | electric or magnetic fields | 
| positronium | electric or magnetic fields |   |   | Bose-Einstein statistics |   | boson | integral |   |   |   | the products produced immediately after decay | A positron and electron bound together electrostaticaly. | 0 | The average time in which a particle decays |   |   |   |   |   |   | 
| radioactive element |   | Universe | radioactive particle |   |   |   |   | atom |   |   | the products produced immediately after decay | an unstable radioactive element which has an excess or deficit of neutron relative to the stable element |   | The average time in which a particle decays |   |   |   |   |   |   | 
| tau |   |   |   | Fermi-Dirac statistics |   | radioactive particle | 1/2 |   |   |   | the products produced immediately after decay |   | -1 | The average time in which a particle decays | τ |   |   |   |   | electric or magnetic fields | 
| triton |   | element |   |   |   | radioactive particle |   |   |   |   | the products produced immediately after decay | The nucleus of the tritium atom. | 1 | The average time in which a particle decays | T |   |   |   |   | electric or magnetic fields |