Symmetry breaking in statistical nuclear reactions: are two-state-models useful?

Abstract

An interesting feature of compound nucleus reactions is that they enhance violations of fundamental symmetries (parity and time reversal). This fact has repeatedly been pointed out in the framework of a two-resonancemodel. Two resonances -isolated from all others do not exist in nuclei. Here, this objection is investigated in a statistical sense. It is shown that the two-level-model yields results that are partly identical, partly quite similar to those from the multi-level-model.