What is Isospin and How Does it Relate to the Strong Force?

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What exactly is isospin and what does it have to do with the strong force?
 
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protons and neutrons behave similarly owing to strong interaction between them.Isospin is used to give both proton and neutron, a quantum number.+1/2 and -1/2 but the opposite is also used in literature.You can see landau's book 'non-relativistic quantum mechanics' for an accessible account of it.
 

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