A Monte Carlo model predicts that a three-grating neutron moiré interferometer with a one-ton lead mass can measure G to 150 ppm, and reanalysis suggests lunar tides may add tens of ppm to some prior torsion pendulum results.
By lowering the gratings below the neutron beam height, the source mass can be translated into the beam, providing an accurate displacement zero in the horizontal direction
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Design and Monte Carlo Simulation of a Phase Grating Moir\'e Neutron Interferometer to Measure the Gravitational Constant
A Monte Carlo model predicts that a three-grating neutron moiré interferometer with a one-ton lead mass can measure G to 150 ppm, and reanalysis suggests lunar tides may add tens of ppm to some prior torsion pendulum results.