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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.
Antiprotonic helium is a three-body atom 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 an electron and an antiproton each have a charge of −1 e, whereas a helium nucleus has a charge of +2 e. It has the longest ...
Protonium (symbol: Pn) [citation needed], also known as antiprotonic hydrogen, is a type of exotic atom in which a proton (symbol: p) and an antiproton (symbol: p) are bound to each other. [1] Since protonium is a bound system of a particle and its corresponding antiparticle, it is an example of a type of exotic atom called an onium.
An antiproton consists of two up antiquarks and one down antiquark (u u d). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception of the antiproton having opposite electric charge and magnetic moment from the proton.
BEV-938. Antiproton set-up with work group: Emilio Segre, Clyde Wiegand, Edward J. Lofgren, Owen Chamberlain, Thomas Ypsilantis, 1955 In order to create antiprotons (mass ~938 MeV/c 2) in collisions with nucleons in a stationary target while conserving both energy and momentum, a proton beam energy of approximately 6.2 GeV is required.
The Antiproton Decelerator (AD) is a storage ring at the CERN laboratory near Geneva. [1] It was built from the Antiproton Collector (AC) to be a successor to the Low Energy Antiproton Ring (LEAR) and started operation in the year 2000. Antiprotons are created by impinging a proton beam from the Proton Synchrotron on a iridium target. The AD ...
After the Antiproton Accumulator (AA) had been operational since 1980, the update program ACOL (Antiproton COLlector) was proposed in 1983. [1] The update comprised improvement work on the antiproton source, the construction of the Antiproton Collector (AC), as well as reconstructions of the injection and ejection systems of the Antiproton Accumulator (AA) and its stochastic cooling system.
The Antiproton Accumulator (AA) was an infrastructure connected to the Proton–Antiproton Collider (Sp p S) – a modification of the Super Proton Synchrotron (SPS) – at CERN. [ 1 ] [ 2 ] The AA was built in 1979 and 1980, for the production and accumulation of antiprotons .