Subject |
is part of |
has desintegration energy |
is a kind of |
has discovery in space date |
has quantum behavior |
has acceptance statu |
has number of quark |
is an instance of |
obey |
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 |
antiproton | | the total energy produced when the particle decays | | | Fermi-Dirac statistics | | 3 | radioactive particle | uncertainty principle | | | | 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 | | | |
antiquark | | | charged particle | | | hypothetical | | | uncertainty principle | | | | | The antiparticle of the quark. | non-zero | | | quark | | | |
cosmic rays | | the total energy produced when the particle decays | charged particle | | | | | | uncertainty principle | 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 |
deuteron | element | | | | | | | charged particle | uncertainty principle | | | | | The nucleus of a deuterium atom. md = 2.01355 amu. | 1 | | d | | | | |
electron | element | | charged particle | | Fermi-Dirac statistics | | | | uncertainty principle | | | | | Light elementary particle with a negative electrical charge. Electrons are found in shells surrounding the nuclei of atoms; their interactions with the electrons of neighboring atoms create the chemical bonds that link atoms together as molecules. | -1 | | | positron | | | |
ionized methylidyne | | | | | | | | charged particle | uncertainty principle | | | | | | 1 | | CH+ | | | | |
muon | | the total energy produced when the particle decays | | | Fermi-Dirac statistics | | | charged particle | uncertainty principle | | | | 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 | | | | |
nucleus | element | | charged particle | | | | | | uncertainty principle | | | | | The massive, positively charged central part of an atom, composed mainly of protons and neutrons, around which the electrons revolve. The radius of an atomic nucleus is directly proportional to the cube root of its mass. Density at least 1014 g cm-3. Radius 10-12-10-13 cm. | non-zero | | | | | | |
pi+ | | | | | Bose-Einstein statistics | | 2 | charged particle | uncertainty principle | π-meson | | 273 me | muon, neutrino | | 1 | -has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press | | | | | |
pi- | | | | | Bose-Einstein statistics | | 2 | charged particle | uncertainty principle | π-meson | | 273 me | muon, neutrino | | -1 | -has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press | | | | | |
positron | | the total energy produced when the particle decays | | | Fermi-Dirac statistics | | | radioactive particle | uncertainty principle | 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 | |
proton | nucleus | | | | Fermi-Dirac statistics | | 3 | charged particle | uncertainty principle | | | 939 MeV | | A positively charged elementary particle; the nucleus of a hydrogen atom. Mass of proton 1.00728 amu = 1.6726 × 10-24 g = 1836.12 me. | 1 | -has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press | p | | | | two up quarks and one down quark |
quark | nucleon | | charged particle | | Fermi-Dirac statistics | hypothetical | | | exclusion principle | | | | | Fundamental particles from which all hadrons are made. According to the theory of quantum chromodynamics, protons, neutrons, and their higher-energy cousins are composed of trios of quarks, while the mesons are each made of one quark and one antiquark. Held together by the strong nuclear force, quarks are not found in isolation in nature today; see asymptotic freedom. | non-zero | | | antiquark | | | |
tau | | the total energy produced when the particle decays | | | Fermi-Dirac statistics | | | radioactive particle | uncertainty principle | | | | the products produced immediately after decay | | -1 | The average time in which a particle decays | τ | | | | |
triton | element | the total energy produced when the particle decays | | | | | | radioactive particle | uncertainty principle | | | | the products produced immediately after decay | The nucleus of the tritium atom. | 1 | The average time in which a particle decays | T | | | | |