isospin

/ˈaɪsoʊˌspɪn/
noun
  1. A property of subatomic particles, similar to spin, that helps describe how particles like protons and neutrons interact in the strong nuclear force.
    • In particle physics, isospin symmetry helps explain why certain particles have similar masses.
    • Physicists use isospin to group protons and neutrons together as different states of the same particle.
    • The concept of isospin was important for understanding nuclear reactions.
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