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Wide-Angle Neutron Polarization Analysis


The capabilities of many neutron scattering instruments would be greatly enhanced by neutron polarization analyzers that can cover a wide angular range. 


We have tested a polarizer-analyzer-spin flipper system based solely on 3He spin filters on the Multi-Axis Crystal Spectrometer (MACS) at the NIST Center for Neutron Research. The compact system is housed by a 36 cm diameter, vertical solenoid. Nuclear magnetic resonance (NMR) is used to flip the 3He polarization in the 3He polarizer, thereby inverting the polarization of the incoming neutron beam.  The polarization of neutrons scattered into a wide angular range are analyzed by a second 3He spin filter cell. The system has been demonstrated on MACS and the first physics experiment was performed in Nov. 2010 and the results published in Physical Review Letters.


Lead Organizational Unit:



Neutron Physics Group

Thomas R. Gentile