Tuesday, February 23, 2010, 11:00 am — Small Seminar Room, Bldg. 510
The NPDGamma experiment proposes to measure the asymmetry of the gamma ray direction relative to the neutron spin when polarized neutrons capture on protons. The asymmetry results from the weak parity-violating hadronic interaction. The goal is to measure the asymmetry with 1e-8 sensitivity. Such a measurement will provide a theoretically clean value of the weak pion-nucleon coupling, resolving a long standing controversy in nuclear physics. Phase one of the experiment completed at the Los Alamos Neutron Science Center (LANSCE) reports a result consistent with zero: -1.1
+/- 2.1 (stat)
+/- 0.2 (sys) e-7. The experiment is under construction at Oak Ridge
National Laboratory,
to be installed at the Fundamental Neutron Physics Beam (FNPB) line at the Spallation Neutron Source (SNS). The liquid hydrogen target currently being modified at the Indiana University Cyclotron Facility (IUCF), will be moved to SNS early 2010.
The phase 2 data
will be taken in 2010. I will give an overview describing the experiment, each components and especially the design and performance of the NPDGamma hydrogen target system.
Hosted by: David Jaffe
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