Word: proton
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...believes that it hit an ordinary proton in the aluminum wrapping of the film pack and annihilated not only itself but the earthly matter in its target as well, turning all of their mass into energy...
...times the energy of the particles shot out by the University of California's powerful bevatron, and 50 million times the energy of a splitting uranium atom in an Abomb. The "something," Physicist Schein thought, was most probably an illusive particle called an antiproton (negative proton), which theoretical physicists have long guessed about, but never observed...
Professor Rossi believes that the original particle may have been an antiproton that hit a normal proton in the brass plate and annihilated it. Apparently the encounter produced nothing but energy, and it produced too much (about 1.3 billion electron-volts) to be accounted for by any other process...
Flashing Particles. Fortified with this knowledge, two Atomic Energy Commission physicists, Frederick L. Reines and Clyde Cowan Jr., gathered an erudite task force at Los Alamos Scientific Laboratory and went hunting neutrinos. Theory told them that if a neutrino hits a proton, as may happen on very rare occasions, the reaction should yield a neutron and a positron (positive electron). If this happens in a liquid that scintillates in the proper manner, both particles will give flashes of light...
...University of California scientists who designed and built the bevatron are gradually stepping up its energy, starting only small groups of protons around the magnetic race track, but already their energy at the end of their run is 4.7 billion electron-volts. This is twice the energy of the second largest accelerator, the cosmotron at Brookhaven National Laboratory, Long Island. It is the energy of middle sized cosmic-ray particles, which have been accelerated, perhaps for billions of years, by unknown forces in space. Each proton at the end of its journey has a mass six times as great...