Crossword clues for antineutron
The Collaborative International Dictionary
antineutron \antineutron\ n. The antiparticle of a neutron. It has the same mass as a neutron, but a spin and magnetic moment opposite that of the neutron.
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 corresponding to a neutron.
WordNet
n. the antiparticle of a neutron
Wikipedia
The antineutron is the antiparticle of the neutron with symbol . It differs from the neutron only in that some of its properties have equal magnitude but opposite sign. It has the same mass as the neutron, and no net electric charge, but has opposite baryon number (+1 for neutron, −1 for the antineutron). This is because the antineutron is composed of antiquarks, while neutrons are composed of quarks. The antineutron consists of one up antiquark and two down antiquarks.
Since the antineutron is electrically neutral, it cannot easily be observed directly. Instead, the products of its annihilation with ordinary matter are observed. In theory, a free antineutron should decay into an antiproton, a positron and a neutrino in a process analogous to the beta decay of free neutrons. There are theoretical proposals that neutron–antineutron oscillations exist, a process which would occur only if there is an undiscovered physical process that violates baryon number conservation.
The antineutron was discovered in proton–antiproton collisions at the Bevatron ( Lawrence Berkeley National Laboratory) by Bruce Cork in 1956, one year after the antiproton was discovered.
Usage examples of "antineutron".
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.
Harun got around this difficulty in a final burst of abstract mathematics, showing that it was actually neutrons or antineutrons that were spilling through the domain walls, depending on whether the adjoining reality was mirrored or notthe universes themselves coming in nested pairs that are curled up as mere points in the infinitely small Kaluza-Klein dimensions.
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.