Definition of isospin in English:

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isospin

Pronunciation: /ˈīsəˌspin/

noun

Physics
A vector quantity or quantum number assigned to subatomic particles and atomic nuclei and having values such that similar particles differing only in charge-related properties (independent of the strong interaction between particles) can be treated as different states of a single particle.
Example sentences
  • In short, they are similar to electric charge, isospin, and all the other internal quantum numbers of elementary particles.
  • This symmetry is related to the concept of isospin, and is not the same as charge conjugation.

Origin

1960s: contraction of isotopic spin, isobaric spin.

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