Feshbach resonance

== English == === Etymology === Named after American physicist Herman Feshbach. === 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