Fri Jan 22 13:17:37 1999
Finished determining the dE/dX for muons in water. This is to
be used to convert between the muboy vector file info and track input
kinematics. The following were made with dtrack/dgustep which is in
usmc/gtracking. About 1000 7.5 GeV muons starting just below the PMTs
going down the center of the tank were used.
This shows dE/dX integrated over GEANT track steps and all muon
tracks.
This shows dE/dX vs distance from the stopping point. Since I
will use muons that are at least 10m long, I fit the above to a flat
curve from 10m to 30m and use PAW to integrate from 0 to 10m (``locate
! i''). The fit gives 2.278 MeV/cm and the integration gives 2269 MeV
for 10m. So the sharp rise at the very end of the track ``fills in''
the dip near minimum ionization (~100 MeV). To simplify I will just
use a flat length to energy conversion:
Energy = 2.28 * Length
Energy in MeV, Length in cm.