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[ahy-suh-spin] /ˈaɪ səˌspɪn/
noun, Physics.
Origin of isospin
by shortening Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for isospin


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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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isospin in Science
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 number, strangeness.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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