0000000001157340

AUTHOR

M. Baron

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Measurement of the Coherent Neutron Scattering Length of (3) He.

2005

By means of neutron interferometry the s-wave neutron scattering length of the (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 order to evaluate the m…

Physicsbusiness.industryGeneral EngineeringPhase (waves)Neutron scatteringelastic neutron scatteringneutron interferometryproperties of the 3He nucleusArticleComputational physicsScattering amplitudeInterferometryOpticsPerfect crystalNISTNeutronreal part of the coherent scattering lengthbusinessRefractive indexfew body systemsJournal of research of the National Institute of Standards and Technology
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