Abstract
We report a 0.08% measurement of the bound neutron scattering length of using neutron interferometry. The result is . The corresponding free atomic scattering length is . With this result the world average becomes , a 2% downward shift and a reduction in uncertainty by more than a factor of six. Our result is in disagreement with a previous neutron interferometric measurement but is in good agreement with earlier measurements using neutron transmission.
- Received 30 October 2019
DOI:https://doi.org/10.1103/PhysRevLett.124.012501
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