Abstract
For the evaluation of cold and ultracold neutron production, cross section models for neutron scattering from liquid hydrogen and liquid deuterium are developed. They are based on the proper treatment of molecular motions in the liquids in terms of individual translations and intermolecular correlations. Intramolecular motions such as nuclear spin correlations, free rotations and harmonic vibrations are also included. The calculated results agree very well with the experimental results, both double-differential and total, at different temperatures between the melting and boiling points in different ortho-para contents for a wide range of incident neutron energies. It is expected that the present models serve as cross-section data for the optimum design of advanced neutron sources.
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