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We report on the performance of a 1 m 3 TPC filled with CF4 at 3 bar, immersed in liquid scintillator and viewed by photomultipliers. Particle detection, event identification and localization achieved by measuring both the electric current and the scintillation light are presented. Particular features of α particle detection are also discussed. Finally, the 54 Mn photopeak, reconstructed from the Compton scattering and recoil angle is shown.PACS numbers: 29.40. +G+M, 13.15, 26.65, 96.60.J

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The production of fast neutrons (1 MeV -1 GeV) in high energy muon-nucleus interactions is poorly understood, yet it is fundamental to the understanding of the background in many underground experiments. The aim of the present experiment (CERN NA55) was to measure spallation neutrons produced by 190 GeV/c muons scattering on carbon, copper and lead targets. We have investigated the energy spectrum and angular distribution of spallation neutrons, and we report the result of our measurement of the neutron production differential cross section.