College Park, Maryland June 6 - 10 , 2004
M4-B1 (3:45 PM): Measurement of the parity-violating gamma-ray asymmetry in the neutron-proton capture (Invited)
F. W. Hersman (University of New Hampshire), for the NPDGamma CollaborationThe NPDGamma experiment is currently being commissioned at the Los Alamos Neutron Science Center. The goal of the experiment is to measure the parity-violating gamma asymmetry A gamma in the reaction n + p- > d + gamma. The asymmetry is predicted to be ~ 5x10-8, and its measurement will provide a theoretically clean measurement of the weak pion-nucleon coupling, which is believed to be the longest range component of the hadronic weak interaction. The results of the winter 2004 commissioning run, including the performance of the polarized 3He spin filter and analyzer, will be presented. Production data collection with a proton target will begin in Fall 2004.
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