Emilio SegrŠ- looked for negatively charged particles with mass similar to that of a proton among particles generated from the bombardment of high-energy protons. They observed a starburst, resulting from annihilation.
Today, antiprotons are routinely produced by first accelerated to an energy of 120 billion electron volts (120 GeV) in the Main Injector, extracted and transported to a target area. The protons collide with a nickel target. The collisions in the target produce a wide range of secondary particles including many antiprotons. The antiprotons are focused using a lithum lens and are transported to the Debuncher ring where they are reduced in size by a process known as stochastic cooling. They are then transferred to the Accumulator ring for storage. Finally, when a sufficient number has been produced, the antiprotons are reinjected into the Main Injector and passed down into the Tevatron where they are accelerated simultaneously with a counterrotating beam of protons to an energy of nearly one trillion electron volts (1 TeV).
A year after the discovery of antiproton, found another reaction for proton antiproton,
The decays of antiparticles and antimatter are complicated, and we just begin to have a glimpse of the asymmetry between matter and antimatter. Charge-parity violation may be one of the reasons. See Matter and Antimatter for further information.