The los alamos national laboratory neutron-neutron scattering program

A theoretical and experimental program is underway to determine the feasibility of a measurement of the neutron-neutron scattering cross section of 10-12% uncertainty using small-angle, low center-of-mass energy, colliding neutron beams derived from a fusion-fission nuclear source, The neutron-neutron scattering length would be inferred from the measured cross sections. The general concept of the experiments and progress are discussed.