Isotopic Spin


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isotopic spin

[¦ī·sə¦täp·ik ′spin]
(nuclear physics)
A quantum-mechanical variable, resembling the angular momentum vector in algebraic structure whose third component distinguished between members of groups of elementary particles, such as the nucleons, which apparently behave in the same way with respect to strong nuclear forces, but have different charges. Also known as isobaric spin; isospin; i-spin.

Isotopic Spin

 

one of the characteristics of strongly interacting particles that determines (together with other characteristics—mass, spin, and baryon charge) whether or not the particle belongs to a group of particles with similar properties (but with different electric charges) that participate identically in strong interactions. (See ISOTOPIC INVARIANCE.)

References in periodicals archive ?
One day I was giving a talk at Princeton on why conservation of isotopic spin failed to work as an explanation of the long lifetime and, mentioning the [baryons], I was going to say, "Suppose they have I = 5/2,' but .