Abstract
Recent measurements of parity nonconserving (PNC) effects in $^{238}\mathrm{U}$ and $^{232}\mathrm{Th}$ contradict the results of random matrix theory for nuclear compound states. In this work the value of the PNC effect is expressed in terms of a wave function at the nuclear surface where the wave function of the compound state is not ``random'' due to boundary conditions. A mechanism is suggested which can explain the permanent sign and large value of these effects. The correlations between compound-state components are considered. The T- and P-odd effects can be expressed in terms of observed P-odd effects. The ``dynamical enhancement'' of small interactions in other reactions and other systems is also discussed.
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