Multiple small angle neutron scattering:: A new two-dimensional ultrasmall angle neutron scattering technique

We report on the demonstration experiment of the multiple small angle neutron scattering (MSANS) technique at a 5.6 m long neutron beam line, leading to a q resolution of 3x10(-4) angstrom(-1). The MSANS technique is based on two two-dimensional multihole apertures placed at the front end of the collimator and close to the sample, respectively. By choosing the proper MSANS geometry, individual diffraction patterns are superimposed leading to a large gain in intensity. Using MSANS as an option for standard small angle neutron scattering beam lines, the q resolution could be increased to 10(-5) angstrom(-1) without dramatically sacrificing intensity. (c) 2007 American Institute of Physics.