Papers AntiMatter (Lawrence Berkeley National Laboratory - Nuclear Science Division) "In 1930, Paul Dirac developed the first description of the electron that was consistent with both quantum mechanics and special relativity. One of the remarkable predictions of this theory was that an anti-particle of the electron should exist." 7-04 Antimatter (CERN) "For every particle (matter) there is a corresponding antiparticle (antimatter). Antiparticles are the same as the corresponding matter particle in every respect except for their opposite charges. A proton is electrically positive: an anti-proton is electrically negative. They both have the exact same mass, so they are affected in the same way by gravity." "When a particle and its antiparticle meet, they annihilate into pure energy. This energy may then give rise to neutral force-carrier particles, such as photons, Z bosons, or gluons." 06-07 Antimatter (IBL.gov) "n 1930, Paul Dirac developed the first description of the electron that was consistent with both quantum mechanics and special relativity. One of the remarkable predictions of this theory was that an anti-particle of the electron should exist. This antielectron would be expected to have the same mass as the electron, but opposite electric charge and magnetic moment. In 1932, Carl Anderson, was examining tracks produced by cosmic rays in a cloud chamber. One particle made a track like an electron, but the curvature of its path in the magnetic field showed that it was positively charged. He named this positive electron a positron. We know that the particle Anderson detected was the anti-electron predicted by Dirac. In the 1950's, physicists at the Lawrence Radiation Laboratory used the Bevatron accelerator to produce the anti-proton, that is a particle with the same mass and spin as the proton, but with negative charge and opposite magnetic moment to that of the proton. In order to create the anti-proton, protons were accelerated to very high energy and then smashed into a target containing other protons. Occasionally, the energy brought into the collision would produce a proton-antiproton pair in addition to the original two protons. This result gave credibility to the idea that for every particle there is a corresponding antiparticle." 06-07 Antimatter Space Ships (HowStuffWorks.com) Describes how an antimatter space ship might produce a great deal more energy than any other source now known and even allow interstellar travel, travel to other planets from distant stars. 06-07 Making Antimatter (Space.com - Schultz) Explains how antimatter is created in the laboratory. Visitors also spell it anti-matter. 1-01 Race Is on to Make Antimatter Atoms (MSNBC - Cosmic Log) "It's not often that a scientific experiment gets written up as a front-page news story, as well as a science-fiction twist in a best-selling thriller and a can't-miss movie script - but that's what's been happening to CERN's Antiproton Decelerator facility, the only place in the world where whole atoms of antimatter are built." 06-07

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