Recovery of reduced fringe visibility due to finite crossing angle between two paths of a neutron interferometer

►The presence of a finite crossing angle between the two paths of a neutron interferometer degrades its fringe visibility.. ►A crossing angle of 1.0 ?rad was introduced by the use of an optical component consisting of a magnetic multilayer mirror, a wedge-shaped gap layer, and a nonmagnetic multilayer mirror. ►To restore the interference fringes, magnetic gradients of 0.64 G / cm were applied using two electro-quadrupole magnets.