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Article: Measurement of the coherent neutron scattering length of [.sup.3]He.
- Article from:
- Journal of Research of the National Institute of Standards and Technology
- Article date:
- May 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 National Institute of Standards and Technology. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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By means of neutron interferometry the s-wave neutron scattering length of the [.sup.3]He nucleus was re-measured at the Institut Laue-Langevin (ILL). Using a skew symmetrical perfect crystal Si-interferometer and a linear twin chamber cell, false phase shifts due to sample misalignment were reduced to a negligible level. Simulation calculations suggest an asymmetrically alternating measuring sequence in order to compensate for systematic errors caused by thermal phase drifts. There is evidence in the experiment's data that this procedure is indeed effective. The neutron refractive index in terms of Sears' exact expression for the scattering amplitude has been analyzed in ...
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