2017 November 22
2017 November 24
We discuss two methods using slow neutrons to search for interactions which violate both parity (P) and time reversal (T) symmetry. The first and most well-known example is the continuing effort to find an electric dipole moment for the neutron. Another possibility is to search for a parity-odd and time reversal-odd amplitude in polarized neutron optical transmission through polarized nuclei. Both of these observables are null tests for P and T violation. Both of these methods also have the potential to improve the sensitivity compared to current limits on P and T violating amplitudes in nucleon-nucleon interactions by about two orders of magnitude.