Positron

•  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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•  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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•  Antineutrino

  In physics, antineutrinos are the antiparticles of neutrinos, which are neutral particles produced in nuclear beta decay. These are emitted in beta particle emissions, where a neutron turns into a proton. They have a spin of 1/2, and they are part of the lepton family of particles. The antineutrinos observed so far all have right-handed helicity (i.e. only one of the two possible spin states has ever been seen), while the neutrinos are left-handed.

  

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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
• Fundamental physics concepts by likeorhate
• Leptons by likeorhate
• Quantum electrodynamics by likeorhate

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•  Gregorian calendar

  The Gregorian calendar is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull known by its opening words Inter gravissimas. The reformed calendar was adopted later that year by a handful of countries, with other countries adopting it over the following centuries.

  

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•  Moses Sofer

  Moses Schreiber, known to his own community and Jewish posterity as Moshe Sofer, also known by his main work Chasam Sofer, (trans. Seal of the Scribe and acronym for Chidushei Toras Moshe Sofer), (1762 - 1839), was one of the leading Orthodox rabbis of European Jewry in the first half of the nineteenth century. He was a teacher to thousands and a powerful opponent to the Reform movement, which was then making inroads into many Jewish communities in Austria-Hungary and beyond.

  

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•  Stephen F. Jones

  Stephen F. Jones is an American expert on post-Communist societies in the former Soviet Union and Eastern Europe who currently serves as a Professor of Russian and Eurasian Studies at Mount Holyoke College, South Hadley, Massachusetts. Originally from England, Jones received his B.A. in 1974 from the University of Essex, his Ph.D. from the London School of Economics in 1984.

  

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•  Dagmar

  Dagmar is a feminine Scandinavian and German given name, derived from the Old Norse name (Dagmær), dagr meaning "day", and mær meaning "maid". Nicknames: Dagie, Dagmarka, Dasha, Digi, Mara. Dagmar is uncommon as a surname or as a male name (as the male version is Dagomar).

  

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•  Tōgō Heihachiro

  

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