An Accurate Measurement of the Spin‐Dependent Neutron‐Deuteron Scattering Length

We briefly report on the progress of an experiment that has the goal to directly determine the bound spin‐dependent neutron‐deuteron scattering length b_i,d by measuring the pseudomagnetic precession of polarized cold neutrons passing through a target with polarized nuclei. A precise measurement of b_i,d can be used to increase the accuracy of the only poorly known doublet neutron‐deuteron scattering length b_2,d which is a crucial input parameter for novel effective field theories. Results of exploratory measurements of b_i,d are shown, which illustrate the capability of the adopted experimental method.