Antineutrino

•  Antimatter

  In particle physics, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles. For example, an antielectron (a positron, an electron with a positive charge) and an antiproton (a proton with a negative charge) could form an antihydrogen atom in the same way that an electron and a proton form a normal matter hydrogen atom.

  

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•  Antiparticle

  Corresponding to most kinds of particles, there is an associated antiparticle with the same mass and opposite electric charge. For example, the antiparticle of the electron is the positively charged antielectron, or positron, which is produced naturally in certain types of radioactive decay. The laws of nature are very nearly symmetrical with respect to particles and antiparticles.

  

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•  Positron

  The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1, a spin of ⁄2, and the same mass as an electron. When a low-energy positron collides with a low-energy electron, annihilation occurs, resulting in the production of two or more gamma ray photons. Positrons may be generated by positron emission radioactive decay, or by pair production from a sufficiently energetic photon.

  

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•  Antimatter rocket

  An antimatter rocket is a proposed class of rockets that use antimatter as their power source. There are several types of design that attempt to accomplish this goal. The advantage to this class of rocket is that a large fraction of the rest mass of a matter/antimatter mixture may be converted to energy, allowing antimatter rockets to have a far higher energy density and specific impulse than any other proposed class of rocket.

  

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•  Antihydrogen

  Antihydrogen is the antimatter counterpart of hydrogen. Whereas the common hydrogen atom is composed of an electron and proton, the antihydrogen atom is made up of a positron and antiproton. Its (proposed) chemical symbol is H, that is, H with an overbar.

  

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•  Antiproton

  The antiproton (p, pronounced p-bar) is the antiparticle of the proton. Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy. It was discovered in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark.

  

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•  Annihilation

  Annihilation is defined as "total destruction" or "complete obliteration" of an object; having its root in the Latin nihil (nothing). A literal translation is "to make into nothing". In physics, the word is used to denote the process that occurs when a subatomic particle collides with its respective antiparticle. Since energy and momentum must be conserved, the particles are not actually made into nothing, but rather into new particles.

  

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•  Antineutron

  The antineutron is the antiparticle of the neutron. It differs from the neutron only in that some of its properties have equal magnitude but opposite sign. It has the same mass as the neutron, and no net electric charge, but has opposite baryon number (+1 for neutron, −1 for the antineutron). This is because the antineutron is composed of antiquarks, while neutrons are composed of quarks. In particular, the antineutron consists of one up antiquark and two down antiquarks.

  

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•  Antimatter weapon

  An antimatter weapon is a hypothetical device using antimatter as a power source, a propellant, or an explosive for a weapon. Antimatter weapons do not currently exist due to the cost of production and the limited technology available to produce enough antimatter in sufficient quantities for it to be an acceptable weapon.

  

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•  Antiprotonic helium

  An antiprotonic helium atom is a three-body object composed of an antiproton and an electron orbiting around a helium nucleus. It is thus made partly of matter, and partly of antimatter. The atom is electrically neutral, since both electrons and antiprotons have a charge of -1, whereas helium nuclei have a charge of +2.

  

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• Antimatter by likeorhate
• Leptons by likeorhate
• Nuclear proliferation by likeorhate
• Neutrinos by likeorhate

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•  Horn (instrument)

  The horn is a brass instrument consisting of about 12 feet (3.7 m) of tubing wrapped into a coil with a flared bell. A musician who plays the horn is called a horn player (or less frequently, a hornist). Descended from the natural horn, the instrument is informally known as the French horn, but since 1971 the International Horn Society has recommended the horn. Horns have valves, operated with the left hand, to route the air into extra tubing to change the pitch.

  

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•  Software-driven graphics modes for the Atari 8-bit computers

  This article describes software driven graphics modes for the Atari 8-bit computers; that is, pseudo-graphics modes whose capabilities are reliant on additional software rather than being supported directly in hardware.

  

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•  La Banda de Shilcayo District

  La Banda de Shilcayo District is one of fourteen districts of the province San Martín in Peru.

  

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•  List of highways numbered 38B

  

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•  Don Octavio

  

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