Jun 2 – 7, 2019
Carnegie Mellon University
America/New_York timezone

The NPDGamma Experiment: Measuring the Hadronic Weak Interaction in Neutron-Proton Capture

Jun 3, 2019, 2:00 PM
Rangos 3

Rangos 3

Invited Fundamental Symmetries Few-Body Systems


Matthew Musgrave (Massachusetts Institute of Technology)


Neutrons have proved themselves to be a useful system to study topics in nuclear, particle, and astrophysics with high-precision, low-energy experiments. At the Fundamental Neutron Physics Beamline (FNPB) at the Spallation Neutron Source (SNS), the NPDGamma experiment investigated the hadronic weak interaction via the capture of cold neutrons on protons. 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 after spin-polarized neutron are captured in a liquid para-hydrogen target. The parity-violating gamma-ray asymmetry is sensitive to the $\Delta I=1$ weak potential and is therefore a measure of the long-range pion component in the meson exchange model of hadronic weak interactions. The experiment, analysis, and final results of the NPDGamma experiment will be presented.

Graduate Student No
Early Consideration No

Primary author

Matthew Musgrave (Massachusetts Institute of Technology)

Presentation materials