  DAE\delta ALUS, the Decay At-rest Experiment for \delta_{CP} at a Laboratory
for Underground Science will look for evidence of CP-violation in the neutrino
sector, an ingredient in theories that seek to explain the matter/antimatter
asymmetry in our universe. It will make a precision measurement of the
oscillations of muon antineutrinos to electron antineutrinos using multiple
neutrino sources created by low-cost compact cyclotrons. The experiment
utilizes decay-at-rest neutrino beams produced by 800 MeV protons impinging a
beam target of graphite and copper. Two well established Monte Carlo codes,
MARS and GEANT4, have been used to optimise the design and the performance of
the target. A study of the results obtained with these two codes is presented
in this paper.
