Isospin | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Isospin


00:01:18 1 Quark content and isospin
00:01:35 1.1 Isospin and symmetry
00:03:14 1.2 Hadron nomenclature
00:05:45 2 History
00:07:10 2.1 Original motivation for isospin
00:07:19 2.2 The particle zoo
00:10:24 2.2.1 An example&#160;: Delta baryons
00:10:47 2.3 Gauged isospin symmetry
00:11:16 2.4 The introduction of quarks
00:11:37 3 Weak isospin
00:12:58 4 See also
00:13:54 5 Notes
00:14:49 6 References
00:16:50 7 External links
00:21:26 undefined
00:22:04 undefined



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SUMMARY
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In nuclear physics and particle physics, isospin (I) is a quantum number related to the strong interaction. More specifically, isospin symmetry is a subset of the flavour symmetry seen more broadly in the interactions of baryons and mesons. 
The name of the concept contains the term spin because its quantum mechanical description is mathematically similar to that of angular momentum (in particular, in the way it couples; for example, a proton-neutron pair can be coupled either in a state of total isospin 1 or in one of 0.). Unlike angular momentum, however, it is a dimensionless quantity, and is not actually any type of spin.
Etymologically, the term was derived from isotopic spin, a confusing term to which nuclear physicists prefer isobaric spin, which is more precise in meaning. Before the concept of quarks were introduced, particles that are affected equally by the strong force but had different charges (e.g. protons and neutrons) were treated as being different states of the same particle, but having isospin values related to the number of charge states.. A close examination of isospin symmetry ultimately led directly to the discovery and understanding of quarks, and of the development of Yang–Mills theory. Isospin symmetry remains an important concept in particle physics.