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 |