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Neutrino-less double beta decay: If neutrinos are Majorana fermions (that is, their own antiparticle), Neutrino-less double beta decay is possible. Several experiments are searching for this. Pair production and annihilation: In the Stückelberg–Feynman interpretation, pair annihilation is the same process as pair production: Møller scattering
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.
==Summary== {{en|The Feynman Diagram for the beta negative decay of a neutron into a proton. The down quark in the neutron decays into an up quark to make a proton, emitting an electron and an electron anti-neutrino.}} ==Source== Created by [[User:Joelhol: 11:05, 7 March 2007: 310 × 310 (20 KB) Joelholdsworth~commonswiki
The Feynman diagram for beta-minus decay of a neutron (n = udd) into a proton (p = udu), electron (e −), and electron anti-neutrino ν e, via a charged vector boson (W −). In one type of charged current interaction, a charged lepton (such as an electron or a muon, having a charge of −1) can absorb a W +
The Feynman diagrams are much easier to keep track of than "old-fashioned" terms, because the old-fashioned way treats the particle and antiparticle contributions as separate. Each Feynman diagram is the sum of exponentially many old-fashioned terms, because each internal line can separately represent either a particle or an antiparticle.
The Feynman diagram for beta decay of a neutron into a proton, electron, and electron antineutrino via an intermediate W − boson. The W and Z bosons are carrier particles that mediate the weak nuclear force, much as the photon is the carrier particle for the electromagnetic force.
The simplest Feynman diagram for beta decay. It contains a charged current interaction at each vertex. Charged current interactions are the most easily detected class of weak interactions. The weak force is best known for mediating nuclear decay. It has very short range, but is the only force (apart from gravity) to interact with neutrinos.
Inverse beta decay proceeds as [2] [3] [4] ν e + p → e + + n, where an electron antineutrino (ν e) interacts with a proton (p) to produce a positron (e +) and a neutron (n). The IBD reaction can only be initiated when the antineutrino possesses at least 1.806 MeV [3] [4] of kinetic energy (called the threshold energy). This threshold energy ...