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A measurement of the absolute neutron beam polarization produced by an optically-pumped 3He spin filter

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arxiv physics/9908050 v1 pith:ZQDRPFRR submitted 1999-08-25 physics.ins-det

A measurement of the absolute neutron beam polarization produced by an optically-pumped 3He spin filter

D. R. Rich , J. D. Bowman , B. E. Crawford , P. P. J. Delheij , M. A. Espy , T. Haseyama , G. Jones , C. D. Keith
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J. Knudson M. B. Leuschner A. Masaike Y. Masuda Y. Matsuda S. I. Penttila V. R. Pomeroy D. A. Smith W. M. Snow S. L. Stephenson A. K. Thompson V. Yuan
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classification physics.ins-det
keywords neutronbeammeasurementpolarizationabsolutefiltermethodoptically-pumped
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The capability of performing accurate measurements of neutron beam polarization opens a number of exciting opportunities in fundamental neutron physics and in neutron scattering. At the LANSCE pulsed neutron source we have measured the neutron beam polarization with absolute accuracy of 0.3% in the neutron energy range from 40 meV to 10 eV using an optically-pumped polarized 3He spin filter and a relative transmission measurement technique. 3He was polarized using the Rb spin-exchange method. We describe the measurement technique, present our results, and discuss some of the systematic effects associated with the method.

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