Crossword clues for antiproton
The Collaborative International Dictionary
antipartticle \an`ti*part"ti*cle\ ([a^]n`t[i^]*[aum]r"t[i^]*k'l), n. (Physics) A fundamental particle which has the same mass as one of the common fundamental particles, but which has an opposite charge, and for which certain other of the properties (e. g. baryon number, strangeness) may be opposite to that of the normal particle. The antiparticle to an electron is called a positron; the antiparticle to a proton is called an antiproton; the antiparticle to a neutron is called an antineutron. When a particle and its corresponding antiparticle collide, they typically annihilate each other with the production of large quantities of energy, usually in the form of radiation. The interaction of a proton and antiproton cause annihilation with production of mesons.
Wiktionary
n. (context physics English) The antiparticle of the proton, having a negative electric charge.
WordNet
n. an unstable negatively charged proton; the antiparticle of a proton
Wikipedia
The antiproton, , (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.
The existence of the antiproton with −1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture. Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of positive and negative solutions to the Energy Equation (E = mc) of Einstein and the existence of the positron, the antimatter analog to the electron, with positive charge and opposite spin.
The antiproton was first experimentally confirmed in 1955 at the Bevatron particle accelerator by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquarks and one down antiquark . The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the antiproton has electric charge and magnetic moment that are the opposites of those in the proton. The questions of how matter is different from antimatter, and the relevance of antimatter in explaining how our universe survived the Big Bang remain open problems—open, in part, due to the relative dearth of antimatter in today's universe.
Usage examples of "antiproton".
Once that state has been achieved, they are collided with heavy nuclei, resulting in a spray of elementary particles that includes antiprotons, antielectrons, and antineutrons.
And when a proton annihilates an antiproton, it produces a pi-zero meson one-third of the time, and a charged pion, a muon, and a neutrino two-thirds of the time, after which the pions and neutrons promptly break down to electrons and positrons, photons and neutrinos.
In properly tuned drives, however, the antiprotons should have been completely consumed, so that their radiation pressure could add to the thrust.
In addition to the usual system of Diracs for the production of the force field, the Cyclops was equipped with an antimatter projectile cannon, which enabled it to shoot off antiprotons simultaneously in any and all directions.
The gas of antiprotons roared without noise around the stump of his wrist.
Grant, he spared a half second to look at the section of inner bulkhead that had been sluiced away by the antiproton beam.
If we go ahead with an antiproton massacre, not one can possibly live through such a hell, if any of them are still alive.
But CERN has now broken ground on its new Antiproton Decelerator-an advanced antimatter production facility that promises to create antimatter in much larger quantities.
Even a millionth of an ampere blast should be avoided, if it was an antiproton current.
He could try other more energetic transmissions, bursts of positrons, muons, gamma rays, or antiprotons that might attract attention to the Bridgehead.
We have evidence from cosmic rays that the same is true for all the matter in our galaxy: there are no antiprotons or antineutrons apart from a small number that are produced as particle/ antiparticle pairs in high-energy collisions.
The antiprotons can be captured, slowed down, and stored in magnetic storage rings.
One by-product of the big particle accelerators at Fermilab in Illinois, at IHEP in Novosibirsk in the Soviet Union, and at CERN in Switzerland, is a supply of antiprotons and positrons.
Antiprotons and water were squirted into a plenum chamber at a three-to-one mix ratio.