Wednesday 13 January 2016 Speaker: Dr Matthew Musgrave (University of Sussex) Title: "Neutron Physics at ORNL and the NPDGamma Experiment" Abstract: Slow neutrons enable the study of fundamental interactions of matter in high-precision, low-energy experiments. Oak Ridge National Laboratory (ORNL) has a long history in neutron physics, and the Fundamental Neutron Physics Beamline (FNPB) at the Spallation Neutron Source (SNS) is their newest tool to address a range of scientific issues including nuclear physics, particle physics, and astrophysics. The first experiment commissioned on the FNPB is the NPDGamma experiment, which tests the hadronic weak interaction. The observation of the hadronic weak interaction is challenging because of the relatively small coupling compared to the hadronic strong interaction but is possible by looking for a parity violating observable. The NPDGamma experiment measures the parity-violating asymmetry in gamma-ray emissions following the capture of polarized neutrons on protons. An overview of the history of neutron physics at ORNL and details of the NPDGamma experiment will be discussed.