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In particle physics, the weak interaction the weak force or weak nuclear force is one of the four known fundamental interactions of nature, alongside the strong interaction, electromagnetism, and gravitation. The weak interaction is responsible for radioactive decay, 1960bet live scores 49ers fight plays an essential role in nuclear fission. The theory of the weak interaction is sometimes called quantum flavourdynamics QFDin analogy with the terms QCD dealing with the strong interaction and QED dealing with the electromagnetic force. However the term QFD is rarely used because the weak force is best understood in terms of electro-weak theory EWT. The Standard Model of particle physics, which does not address gravity, provides a uniform framework for understanding how the electromagnetic, weak, and strong interactions work. An interaction occurs when two particles, typically but not necessarily half-integer spin fermions, exchange integer-spin, force-carrying bosons. The fermions involved in such exchanges can be either elementary e. The mass of each of these bosons is far greater than the mass of a proton or neutron, which is consistent with the short range of the weak force. The force is in fact termed weak 1960bet live scores 49ers fight its field strength over a given distance is typically several 1960bet live scores 49ers fight of magnitude less than that of the strong nuclear force or electromagnetic force. The weak interaction has a coupling constant an indicator of interaction strength of between 10? The weak interaction has a very short range around 10? At distances around 10? At distances of around 3? The nuclear force or nucleon—nucleon interaction or residual strong force is the force between protons and neutrons, subatomic particles that are collectively called nucleons. The nuclear force is responsible for binding protons and neutrons into atomic nuclei. Neutrons and protons are affected by the nuclear force almost identically. The mass of a nucleus is less than the sum total of the individual masses of the protons and neutrons which form it.



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