Number 119 (Story #2), March 19, 1993 by Phillip F. Schewe and Ben Stein THE ADVANCED NEUTRON SOURCE (ANS) , a high-flux reactor to be built at Oak Ridge, will provide 10-20 times more neutrons than the Institut Laue Langevin (ILL) in Grenoble, France, currently the best source of research neutrons from a reactor. Such neutrons are used in studying the structure of materials. The $1.5 billion ANS should arrive with the millennium. Meanwhile at the Rutherford Appleton Lab in the UK, the ISIS neutron source reached its design current last month. ISIS is the world's leading spallation neutron source; 800-MeV protons are smashed into a target, producing a rich beam of neutrons, as well as neutrinos, which can be used for experiments, such as in the German KARMEN neutrino detector. A muon beam may also be set up. (Physics World, March 1993.)