The neutrino program at LAMPF

There are two neutrino experiments that this paper discusses: the first experiment is designed to verify the interference between charged and neutral current amplitudes in νe- e scattering. The experiment is situated at 90 degree to the beam stop, and detected recoil electrons from neutrino electron scattering. The experiment is sensitive to recoil electrons from νμ, νe, bar νμ but the cross section for νe - e scattering is the dominant contribution. The magnitude of this cross section depends on the size of the interference term between charged and neutral current scattering, and the value for this term is -1.07 ± 0.017 ± 0.11 to be compared to -1.08 from standard electroweak theory with sin2θW = 0.23. The observation of this interference is unique to this experiment. The second experiment, which is presently finishing data analysis after concluding data taking in 1989, is a search for neutrino oscillations of the type bar νmu → bar νe. The experiment was designed to search for the reaction bar νe + p → e+ + n, which has a large relative cross section compared to that on complex nuclei due to the absence of Pauli Suppression of the reaction on free nucleons producing electrons in the energy range 30--50 MeV in contrast to the dominant background from νe + 12C → e+ + 12N, in which the electron energies are limited to 30 MeV from the Q value of the reaction. 5 refs., 13 figs