Antineutron

Antineutron ()

The Antineutron is in the standard model the antiparticle of the neutron. According to the quark model, it consists of two anti -down quark and an anti -up quark.

The Antineutron in 1956, one year after the discovery of the antiproton, B. Cork et al. discovered. It has as the neutron has a mass of about 939.6 MeV, is electrically uncharged with a spin of ½ and is therefore a fermion. The masses of neutron and Antineutron are smaller than (9 ± 5) × 10-5 with an uncertainty equal. CPT Theorem predicts certain characteristics of particles / antiparticle which can be experimentally tested with the aid of Antineutrons for example. The Antineutron is interesting because of its electromagnetic interaction- free Annihilationsreaktionen ( Nantin ) → Prod and ( nantip ) → Prod. Conversely, anti- neutrons can be generated, for example, in the annihilation of accelerated high-energy electrons and positrons: Nantin e e - →.

Although the Antineutron the same electric charge, and the same spin as that of the neutron, there is another particle, since it is composed of antiquarks. The free Antineutron decays into an antiproton, a positron and an electron neutrino, while the free neutron decays into a proton, an electron and an electron antineutrino. The lifetime and the gyromagnetic moment of free Antineutrons have not yet been determined experimentally so far.

The experimental search for neutron - Antineutron oscillations is considered as a further test of the quark theory. In vacuo, the free neutrons to Antineutron fluctuates with a time constant of greater than years.

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