eta particle
[ ā′tə, ē′tə ]
An electrically neutral meson having a mass 1,071 times that of the electron and a mean lifetime of approximately 3.5 X 10-8 seconds. See Table at subatomic particle.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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