Low-Energy Electron-Nucleus Scattering—a Possible Test for Weak-Interaction Theories

We investigated the excitation of nuclei by longitudinally polarized electrons in view of parity mixtures of nuclear states. The asymmetry in the cross section for the left- and right-polarized electrons is shown to be already very large at low momentum transfer. In many cases the asymmetries caused by parity mixtures are larger by orders of magnitude compared to the contributions expected from weak $Z^0$-boson exchange.