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This proposal describes an experimental search for sterile neutrinos beyondthe Standard Model with a new CERN-SPS neutrino beam. The experiment is basedon two identical LAr-TPC's followed by magnetized spectrometers, observing theelectron and muon neutrino events at 1600 and 300 m from the proton target.This project will exploit the ICARUS T600, moved from LNGS to the CERN "Far"position. An additional 1/4 of the T600 detector will be constructed andlocated in the "Near" position. Two spectrometers will be placed downstream ofthe two LAr-TPC detectors to greatly complement the physics capabilities.Spectrometers will exploit a classical dipole magnetic field with iron slabs,and a new concept air-magnet, to perform charge identification and muonmomentum measurements in a wide energy range over a large transverse area. Inthe two positions, the radial and energy spectra of the nu_e beam arepractically identical. Comparing the two detectors, in absence of oscillations,all cross sections and experimental biases cancel out, and the twoexperimentally observed event distributions must be identical. Any differenceof the event distributions at the locations of the two detectors might beattributed to the possible existence of {\nu}-oscillations, presumably due toadditional neutrinos with a mixing angle sin^2(2theta_new) and a larger massdifference Delta_m^2_new. The superior quality of the LAr imaging TPC, inparticular its unique electron-pi_zero discrimination allows full rejection ofbackgrounds and offers a lossless nu_e detection capability. The determinationof the muon charge with the spectrometers allows the full separation of nu_mufrom anti-nu_mu and therefore controlling systematics from muonmis-identification largely at high momenta.

Search for "anomalies" from neutrino and anti-neutrino oscillations at Delta_m^2 ~ 1eV^2 with muon spectrometers and large LAr-TPC imaging detectors