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An attempt to determine accurately the neutron scattering length of holmium from Ho2O3 and Ho2O2S powders did not give accurate results. It indicated however that the currently accepted value bHo = 8.5 × 10-12 mm was too high. A very precise determination was possible with a HoAl2 single crystal and polarized neutrons. The new value is bHo = 8.08 (5) × 10-12 mm.
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