  Based on a Relativistic Boltzmann-Uehling- Uhlenbeck transport model, proton
and $^{3}$He induced reactions on $^{197}$Au target at beam energies of 2.8, 5,
10 and 16.587 GeV/nucleon are studied. It is found that compared with proton
induced reactions, $^{3}$He induced reactions give larger cross sections of
pion production, about 5 times those of the proton induced reactions. And more
importantly, pion production from $^{3}$He induced reaction is more inclined to
low-angle emission. Neutrino production via positively charged pion is also
discussed accordingly.
