Search results
Results From The WOW.Com Content Network
The antineutron is the antiparticle of the neutron with symbol n. 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).
A neutrino (/ nj uː ˈ t r iː n oʊ / new-TREE-noh; denoted by the Greek letter ν) is an elementary particle that interacts via the weak interaction and gravity. [2] [3] The neutrino is so named because it is electrically neutral and because its rest mass is so small that it was long thought to be zero.
The electron neutrino has a corresponding antiparticle, the electron antineutrino (ν e), which differs only in that some of its properties have equal magnitude but opposite sign. One major open question in particle physics is whether neutrinos and anti-neutrinos are the same particle.
The electron neutrino was simply called the neutrino, as it was not yet known that neutrinos came in different flavours (or different "generations"). Nearly 40 years after the discovery of the electron, the muon was discovered by Carl D. Anderson in 1936. Due to its mass, it was initially categorized as a meson rather than a lepton. [26]
The two types of beta decay are known as beta minus and beta plus.In beta minus (β −) decay, a neutron is converted to a proton, and the process creates an electron and an electron antineutrino; while in beta plus (β +) decay, a proton is converted to a neutron and the process creates a positron and an electron neutrino. β + decay is also known as positron emission.
where we use the symbol k to denote the quantum numbers p and σ of the previous section and the sign of the energy, E(k), and a k denotes the corresponding annihilation operators. Of course, since we are dealing with fermions , we have to have the operators satisfy canonical anti-commutation relations.
right-handed anti-particles with equal and opposite weak isospin. All right-handed (regular) particles and left-handed antiparticles have weak isospin of 0. All particles have a property called weak isospin (symbol T 3 ), which serves as an additive quantum number that restricts how the particle can interact with the
This is a hallmark of a neutral current interaction and is interpreted as a neutrino exchanging an unseen Z boson with a proton or neutron in the bubble chamber. The neutrino is otherwise undetectable, so the only observable effect is the momentum imparted to the proton or neutron by the interaction. The discovery of the W and Z