The A dependence of K0 and Λ Neutrinoproduction on nuclei

The A dependence of the production of K0 and Λ is investigated for the first time in neutrino-nuclear reactions using the data obtained with the SKAT bubble chamber. An exponential parametrization (∼Aβ) of the particle yields results in \(\beta _{V^0 } \) = 0.20 ± 0.05 for V0 particles (K0 and Λ), while for π− mesons the A dependence is much weaker (\(\beta _{\pi ^ - } \) = 0.068 ± 0.007). A nuclear enhancement of the ratio K0/π− is found; this ratio increases from 0.055 ± 0.013 for vN interactions up to 0.070 ± 0.011 at A ≈ 21 and 0.099 ± 0.011 at A ≈ 45. It is observed that the multiplicity rise of V0 occurs predominantly in the backward hemisphere of the hadronic system. It is shown that the A dependence of the Λ0 and π− yields can be reproduced in the framework of a model incorporating the secondary intranuclear interactions of pions originating from the primary vN interactions.