Editing Neutron scattering (section)

== History ==
The first neutron diffraction experiments were performed in the 1930s.<ref name = "ibach"/> However it was not until around 1945, with the advent of nuclear reactors, that high [[neutron flux]]es became possible, leading to the possibility of in-depth structure investigations. The first neutron-scattering instruments were installed in beam tubes at multi-purpose research reactors. In the 1960s, high-flux reactors were built that were optimized for beam-tube experiments. The development culminated in the high-flux reactor of the [[Institut Laue-Langevin]] (in operation since 1972) that achieved the highest neutron flux to this date. Besides a few high-flux sources, there were some twenty medium-flux reactor sources at  universities and other research institutes. Starting in the 1980s, many of these medium-flux sources were shut down, and research concentrated at a few world-leading high-flux sources.