High-Energy Neutrino Interactions

This experiment studies neutrino interactions in iron at the highest available energies using the narrow-band neutrino beam N3 and the wide-band neutrino beam N1. The basis of the detector is a massive target-calorimeter in which the energy deposited by a neutrino (or antineutrino) is measured by electronic techniques and the momentum of outgoing muons is determined by magnetic deflection. The detector is constructed in the form of a 20 m long iron-cored toroidal magnet, composed of modules of length 70~cm and 90~cm, and of 3.75~m diameter. Drift chambers placed in between each module measure the trajectory of muons from the neutrino interactions. The modules are of three types. The first ten modules are constructed of 2.5~cm iron plates with 20~scintillator planes inserted between the plates. The next five modules are constructed of 5~cm plates with 15~planes of scintillator and the last six modules are constructed of 15~cm plates with 5~planes of scintillators. The total mass of the detector is @=~1400 tons. Another aim of the experiment is to compare charged-current neutrino interactions in H^2 with those originating in iron, using the wide-band neutrino beam N1. The physics aims of this experiment are : a) to study inclusive neutrino reactions in iron, b) to study rare processes, in particular multilepton production, c) to compare neutrino interactions in hydrogen and iron. \item $ \pi ^\pm $ \item $ e ^\pm $ \item $\sim$ 10$^{7} $ p at 450 GeV/c \item $\sim$ 5 10$^{6} $ $ ^{3} ^{2} S $ at 200 GeV/A \item fluxes similar to H2 \item &eqv 1 10$ ^{7} K ^{O} _{L} $ \item $\sim$ 3 10$ ^{2} K ^{O} _{S} $ \item simultaneous $ K ^{O} _{L} $ and $ K ^{O} _{S} $ \item $>$ 50 GeV/c ~~~~~~~~beam - in preparation \item $\leq$ 10$^{11}$ p at 450 GeV/c \item $\geq$ 5 10$^{7}$ $ ^{3} ^{2} S $ at 200 GeV/A