Word: protons
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...theory of neutrinos predicts that when one hits a proton (an infrequent event), a positron (positive electron) is emitted, and the proton turns into a neutron. Both new particles are unstable. The positron hits an electron, and both are "annihilated," turning into gamma rays. The neutron is absorbed by almost any kind of matter, and if a little cadmium is around, the neutrons captured by it give another burst of energy...
...Cambridge Electron Accelerator will not be as powerful as the proton synchrotron (25 billion to 30 billion electron volts) that is being built at Brookhaven National Laboratory, New York, but the electrons that emerge from it will be the fastest particles created by man. Since electrons are much lighter than protons (the mass of one proton equals 1,837 electrons), they must speed much faster than protons to pack the same punch...
...largest proton accelerator in the world is under construction at Brookhaven, Long Island. The machine, owned by the Atomic Energy Commission will be operated by Harvard in conjunction with eight other institutions through Associated Universities...
...physics' most exciting recent discoveries is the antiproton. It resembles an ordinary proton (present in the nuclei of all atoms), except that its electric charge is negative instead of positive. There may be (but probably are not) places in the universe where antiprotons can exist permanently, but on earth they are short-lived. As soon as one of them touches the nucleus of an ordinary atom, it is annihilated. Both its own matter and the matter of a proton or neutron in the nucleus turn into a flash of energy...
...wheel-like star tells what happens when one of the alien particles is annihilated. The antiproton (P¯ ) enters from the left. It is moving fast at first, but gradually slows down and merges with the nucleus of some unfortunate atom. There it combines with a proton or neutron, and both particles vanish, turning into 1,876 million electron volts of energy. The resulting explosion-extremely violent on the atomic scale-drives off fast-moving fragments that trace the lines of the star...