The quasielastic reaction v,n--t, -p was studied in an experiment using the BNL 7-foot deuterium bubble chamber exposed to the wide-band neutrino beam with an average energy of 1.6 GeV. A total of 1138 quasielastic events in the momentum-transfer range Q 2 = 0.06 -3.00 ( G~V / C )~ were selected by kinematic fitting and particle identification and were used to extract the axial-vector form factor FA(Q2) from the Q 2 distribution. In the framework of the conventional V -A theory, we find that the dipole parametrization is favored over the monopole. The value of the axial-vector mass MA in the dipole parametrizatibn is 1.07+0.06 GeV, which is in good agreement with both recent neutrino and electroproduction experiments. In addition, the standard assumptions of conserved vector current and no second-class currents are checked.
There have been active efforts in the U.S., Europe, and Japan on the design of a neutrino factory. This type of facility produces intense beams of neutrinos from the decay of muons in a high-energy storage ring. In the U.S., a second detailed feasibility study (FS2) for a neutrino factory was completed in 2001. Since that report was published, new ideas in bunching, cooling, and acceleration of muon beams have been developed. We have incorporated these ideas into a new facility design, which we designate as study 2B (ST2B), that should lead to significant cost savings over the FS2 design.
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