GEANT4 Simulations of the ISIS Muon Target at Rutherford Appleton Laboratory

MuSR science requires the availabilty of intense beams
of polarised positive muons. At the ISIS pulsed muon facility
at Rutherford Appleton Laboratory the muons are generated
from a low Z thin slab graphite target inserted in
the proton beam. We report on the use of the Monte Carlo
simulation code Geant4 in simulations of the performance
of the current muon target. The results are benchmarked
against the experimental performance of the target.