  A combination of aluminium prisms inserted into a nested loop interferometer
is used to generate a neutron phase vortex lattice with significant extrinsic
orbital angular momentum, L_z=0.35, on a length scale of 220 microns,
transverse to the propagation direction. Our method is a generalization of
recently developed magnetic methods, such that we can exploit the strong
nuclear interaction. The stronger potential of these prisms allows for the
generation of a tighter lattice. Combined with recent advances in neutron
compound optics and split crystal interferometry our method may be applied to
the generation of intrinsic neutron orbital angular momentum states. Finally,
we assert that, in its current state, our setup is directly applicable to
anisotropic ultra small angle neutron scattering.
