Strong Interaction

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STRONG

INTERACTION


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As discussed earlier, the force that binds quarks together inside nucleons (i.e. neutrons and protons) is known as the strong interaction. This force has a very short range but is the strongest. It operates only within the size of a nucleon.

When two up quarks and a down quark form a proton, or when two down quarks and an up quark form a neutron, the strong interaction has done its job, in much the same way that the electric interaction between a proton and an electron does its job by forming a hydrogen atom.

In addition, there is a residual strong interaction between nucleons, which you can imagine as ‘leaking out' of the individual protons and neutrons. This is sufficient to bind them together in nuclei and is similar in nature to the residual electromagnetic interactions between atoms that are responsible for the formation of molecules.



(a) The strong interaction binds quarks together in nucleons. A residual strong interaction binds nucleons in nuclei. (b) The electrical interaction binds electrons and nuclei together in atoms. A residual electrical interaction binds atoms together in molecules.




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Lavanya

Source: open.edu

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