NEEDS FOR MICROSCOPIC neutron data in nuclearenergy applications have continued to expand over the years. The last two decades have seen steady and at times dramatic progress in the detail and extent to which neutron cross sections can be measured or calculated. Pulsed neutron sources, with associated time‐of‐flight techniques, now dominate almost all energy ranges from fractions of an electron volt to many millions of electron volts. Concurrently, improved detectors such as large liquid scintillator tanks have been developed, and on‐line computers have been designed to manage and analyze experiments involving many parameters.

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