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

Abstract

We report on the demonstration experiment of the multiple small angle neutron scattering (MSANS) technique at a 5.6m long neutron beam line, leading to a q resolution of 3×10−4Å−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 10−5Å−1 without dramatically sacrificing intensity.