1) Arcadian mythology 2) Hypothetical particle 3) Hypothetical physics particle 4) Particle theorized in 1977
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https://www.crosswordclues.com/clue/axion
The axion is a hypothetical elementary particle postulated by the Peccei–Quinn theory in 1977 to resolve the strong CP problem in quantum chromodynamics (QCD). If axions exist and have low mass within a specific range, they are of interest as a possible component of cold dark matter. ==History== ===Reasons for prediction=== As shown by Gerardus ...
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http://en.wikipedia.org/wiki/Axion
(from the article `Physical Sciences`) In 2006 a possible sighting was reported of a predicted but previously unobserved fundamental particle called the axion. The existence of the ...
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http://www.britannica.com/eb/a-z/a/132
Axion detection experiment at Lawrence Livermore National Laboratory. Image credit: LLNL A hypothetical weakly-interacting boson with a tiny mass of between 10
-6 eV (less than one ten-trillionth the mass of a proton) and 10
-3 eV. Its existence, first ...
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http://www.daviddarling.info/encyclopedia/A/axion.html
The brain and spinal cord (cerebrospinal axis). ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: ak′sē-on Definitions: 1. The brain and spinal cord (cerebrospinal axis).
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http://www.medilexicon.com/medicaldictionary.php?t=8927
a hypothetical particle having no charge, zero spin, and small mass: postulated in some forms of quantum chromodynamics.
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https://www.infoplease.com/dictionary/axion
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