Nuclear effects in Reactions νp -> μ^- p π^+ and νp -> μ^- Δ^{++}(1232) on Bound Protons

N. M. Agababyan, N. Grigoryan, H. Gulkanyan, A. A. Ivanilov, Zh. Karamyan, V. A. Korotkov

Published 2011-01-15Version 1

For the first time, the nuclear effects in the reaction \nu p -> \mu^- p \pi^+ on bound protons are investigated at E_\nu = 9 GeV and the effective atomicweight A = 21 of the composite nuclear target using the data obtained with SKAT bubble chamber. The observed nuclear effects are explained by the Fermi-motion of the target proton and secondary elastic scattering of neutrinoproduced hadrons on intranuclear neutrons. The probability of any intranuclear interaction of neutrinoproduced hadrons is extracted: P_int = 0.40+-0.13, while the probability of interactions occurring only via elastic scattering on intranuclear neutrons is estimated to be P_c = 0.14+-0.05. A clear evidence of the \Delta^{++}(1232) and an indication on the \Delta^{++}(1620) isobar states production are observed with the mean yields, respectively, 0.57+-0.09 and 0.40+-0.26 (the latter being corrected for the p \pi^+ decay fraction). The mean yield of \Delta^{++}(1232) is by 1.61+-0.25 times smaller than expected for the reaction on the hydrogen target, thus indicating on its rather strong nuclear absorption.