  A mechanism is considered for generating doorway states and intermediate
structure in low-energy nuclear reactions as a result of collectivization of
widths of unstable intrinsic states coupled to common decay channels. At the
limit of strong continuum coupling, the segregation of broad
(''super-radiating") and narrow (''trapped") states occurs revealing the
separation of direct and compound processes. We discuss the conditions for the
appearance of intermediate structure in this process and doorways related to
certain decay channels.
