NPDGamma: A Measurement of the Parity Violating Directional {gamma}-Ray Asymmetry in Polarized Cold Neutron Capture on Hydrogen
- University of Tennessee, Knoxville, TN 37996 (United States)
The NPDGamma experiment aims to measure the correlation between the neutron spin and the direction of the emitted photon in neutron-proton capture at low momentum transfer. An up-down parity violating asymmetry from this process can be related to the strength of the hadronic weak interaction between nucleons.The first phase of the experiment was completed in 2006 at LANSCE. The methodology will be discussed and preliminary results will be presented. The next run will start in 2009 at the SNS at ORNL with many improvements that will yield a measurement with a projected statistical error of 1x10{sup -8}, 20% of the predicted value for the asymmetry. This will allow the determination of the long range n contribution in the weak interaction between nucleons.
- OSTI ID:
- 21316898
- Journal Information:
- AIP Conference Proceedings, Vol. 1149, Issue 1; Conference: 18. international spin physics symposium, Charlottesville, VA (United States), 6-11 Oct 2008; Other Information: DOI: 10.1063/1.3215634; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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