Precision neutron interferometric measurement of the nd coherent neutron scattering length and consequences for models of three-nucleon forces
T. C. Black, P. R. Huffman, D. L. Jacobson, W. M. Snow, K. Schoen, M. Arif, H. Kaiser, S. K. Lamoreaux, S. A. Werner
Abstract
We have performed the first high precision measurement of the coherent neutron scattering length of deuterium in a pure sample using neutron interferometry. We find bnd = (6.665 +/- 0.004) fm in agreement with the world average of previous measurements using different techniques, bnd = (6.6730 +/- 0.0045) fm. We compare the new world average for the nd coherent scattering length bnd = (6.669 +/- 0.003) fm to calculations of the doublet and quartet scattering lengths from several modern nucleon-nucleon potential models with three-nucleon force (3NF) additions and show that almost all theories are in serious disagreement with experiment. This comparison is a more stringent test of the models than past comparisons with the less precisely-determined nuclear doublet scattering length of and = (0.65 +/- 0.04) fm.
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