Neutron Polarization Measurements with a 3He Spin Filter for the NPDGamma Experiment

Details Neutron Polarization Measurements with a 3He Spin Filter for the NPDGamma Experiment Neutron Polarization Measurements with a 3He Spin Filter for the NPDGamma Experiment

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprd11002m&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #D11.002

Physics

Scientific paper

The Fundamental Neutron Physics Beamline (FNPB) at the Spallation Neutron Source (SNS) provides a pulsed beam of polarized cold neutrons for the NPDGamma experiment which intends to measure the parity violating asymmetry in the emitted gamma rays from the capture of polarized neutrons on protons. The neutrons are polarized by a multi-channel super mirror polarizer, and the polarization can be flipped with an RF spin rotator. The accuracy of the NPDGamma experiment and various commissioning experiments is dependent on the polarization of the neutron beam and the efficiency of the RF spin rotator. These parameters are measured with a polarized ^3He spin filter at multiple points in the beam cross section and with multiple ^3He polarizations. The analysis methods, background effects, and preliminary results will be discussed.

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