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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

process, physical process go
a sustained phenomenon or one marked by gradual changes through a series of states

action, activity, natural process, natural action go
a process existing in or produced by nature (rather than by the intent of human beings)

nuclear reaction
(physics) a process that alters the energy or structure or composition of atomic nuclei

noun.process

7 Subcategories

chain reaction go
a self-sustaining nuclear reaction
disintegration, decay, radioactive decay go
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
endoergic reaction go
a nuclear reaction occurring with absorption of energy
exoergic reaction go
a nuclear reaction accompanied by the evolution of energy
fission, nuclear fission go
a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
fusion, nuclear fusion, nuclear fusion reaction go
a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
spallation go
(physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles