Measurement of the coherent neutron scattering length of [.sup.3]He.

Journal of Research of the National Institute of Standards and Technology | May 1, 2005| | Copyright

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 ...

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