nucleon
Noun
Meaning
a constituent (proton or neutron) of an atomic nucleus
Source: WordNetSynonyms
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Examples
Almost all neutrons that fused instead of decaying ended up combined into helium-4, due to the fact that helium-4 has the highest binding energy per nucleon among light elements.
Another example is the "nucleon particle".
Binding energy per nucleon of common isotopes.
For example, the data showed that some 45% of the energy momentum was carried by electrically-neutral particles in the nucleon.
For heavier nuclei, the binding energy per nucleon in the nucleus begins to decrease.
For nucleon pairs, however, it is often energetically favorable to be at high angular momentum, even if its energy level for a single nucleon would be higher.