Determination of the Gamma-ray Asymmetry in the Capture of Polarized Neutrons on Hydrogen and Deuterium
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Published: 2001
Total Pages: 4
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DOWNLOAD EBOOKThe n+p→d+[gamma] experiment measures the parity-violating directional gamma-ray asymmetry, A[gamma], with uncertainties of 0.5x10−8 when cold polarized neutrons are captured by para-hydrogen. This precision measurement will determine the long-range pion-nucleon weak coupling constant, H{sub {pi}}1, with a precision of 10% of its predicted value, and thus will help to clarify our understanding of the weak interaction between nucleons. The n+p→d+[gamma] experiment on the SNS beamline 14B is designed to take advantage of the high intensity of the source and its pulsed nature. The experiment requires a 30-Hz pulsed beam for optimal performance. In three months of run time the experiment will achieve a statistical uncertainty of 0.5x10−8.