EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-PH-EP/2007-023 09 July 2007 Charged-Particle Multiplicities in Charged-Current Neutrino– and Anti-Neutrino–Nucleus Interactions CHORUS Collaboration Abstract The CHORUS experiment, designed to search for oscillations, consists of a nuclear emul- sion target and electronic detectors. In this paper, results on the production of charged particles in a small sample of charged-current neutrino– and anti-neutrino–nucleus interactions at high energy are presented. For each event, the emission angle and the ionization features of the charged particles produced in the interaction are recorded, while the standard kinematic variables are reconstructed using the electronic detectors. The average multiplicities for charged tracks, the pseudo-rapidity dis- tributions, the dispersion in the multiplicity of charged particles and the KNO scaling are studied in different kinematical regions. A study of quasi-elastic topologies performed for the first time in nu- clear emulsions is also reported. The results are presented in a form suitable for use in the validation of Monte Carlo generators of neutrino–nucleus interactions. To be published in European Physical Journal C