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isospin

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i·so·spin  (s-spn)
n. Abbr. I
A quantum number related to the number of charge states of a baryon or meson.


isospin [ˈaɪsəʊˌspɪn]
n
(Physics / General Physics) an internal quantum number used in the classification of elementary particles. Particles which have very similar properties except for those associated with their charge are regarded as forms of the same fundamental particle with different components of the isospin in a certain direction in an imaginary space Also called isobaric spin isotopic spin

isospin  (s-spn)
A vector quantity of quantum systems (especially subatomic particles) that is conserved in strong interactions and is used to characterize particles that are affected equally by the strong force but have other dissimilar properties, such as different electric charges. For example, protons and neutrons, which are indistinguishable with respect to strong force interactions, have the same isospin. Also called isotopic spin. See also baryon numberstrangeness


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What's more, your everyday gluon has something called negative intrinsic parity and zero isospin.
Among the topics are no-core shell model and reactions, direct reactions with exotic nuclei, isoscaling and symmetry energy in dynamical fragment formation, "pasta" phases in dense stars, and isospin effects on fragmentation mechanisms.
In the case of the strong interaction, the gauge symmetry is the isospin symmetry--the strong interactions are invariant under rotations in the isospin space).
 
 
 
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