Non-statistical effects in neutron capture

Lectures are presented describing present understanding of departures from the extreme statistical model in radiative s- and p-wave neutron capture in the resonance as well as the thermal regions in terms of simple reaction mechanisms. Supporting evidence from inverse threshold photonuclear reactions is also presented. While an exhaustive study is not made, the most interesting examples are treated. Also spin and parity determinations and recent developments in the understanding of M1 transitions are considered. It is concluded that nonstatistical effects in both s- and p-wave radiative neutron capture do exist in the thermal and resonance region. The gamma ray energy dependence of the partial decay widths provide a signature of the type of reaction mechanism. 94 references