Intranuclear cascade inνμNe interactions

We report a study of multiplicities in ${\nu }_{\mu }$Ne charged-current interactions. The data were obtained at Fermilab, using the wide-band neutrino beam incident on the 15-ft bubble chamber filled with a neon-hydrogen mixture. We measure a mean positive-charge excess of 0.58±0.02, and show that it consists mainly of ‘‘grey protons,’’ i.e., protons in the momentum range 0.2 to 1.0 GeV/c. The average number of secondary collisions in the intranuclear cascade is found to be 1.16±0.04. The distribution of the number of grey protons is in good agreement with the model of Andersson, Otterlund, and Stenlund.