Noun
Feshbach resonance (countable and uncountable, plural Feshbach resonances)
(physics) The situation where two slow atoms collide and temporarily stick together, forming an unstable compound with a short lifetime. It is a feature of many-body systems in which a bound state is achieved if the coupling(s) between at least one internal degree of freedom and the reaction coordinates, which lead to dissociation, vanish.
Synonym: Fano-Feshbach resonance
Coordinate term: shape resonance