Weak Parity-Nonconserving Potentials

The weak parity-nonconserving potential due to the exchange of vector bosons and pions is calculated for several weak-interaction Lagrangians. Experimental tests using few-nucleon reactions are discussed. Effects in the reaction $n+p\to d+\gamma$ are estimated in detail. A simple approximate determination of the effective potential for the complex nuclei is included. For reliable information on the weak-interaction Lagrangians, comparison of several processes is needed.