Neutron cross section programs in the energy region from 1 to 24 MeV at the LASL Van de Graaff Facilities

Neutron measurements relevant to the Los Alamos Scientific Laboratory's (LASL) programmatic efforts and to the U.S. fission and fusion energy programs can be divided into four categories: secondary neutron emission cross sections on light elements, gamma-ray production cross sections, total cross sections on light isotopes, and (n,2n) and (n,3n) cross sections. Many of these measurements were performed using the unusual capabilities of the LASL's Van de Graaffs. This is especially true for the high energy (greater than or equal to 20 MeV) measurements on (n,2n) and (n,3n) cross sections. One describes briefly the four types of measurements, to illustrate each measurement with some examples, and to present any new data that are not as yet available in the literature. One also indicates in which programs new measurements are planned for the next year