This is an old revision of the document!
introduction
A study is ongoing to try to understand the specific differences between FLUKA and Geant4 simulations. Comparison to data are pursued wherever possible, although data is difficult to produce and not very abundant at present. This page reflects the state of the comparison as it existed in April 2013. This includes what was presented at the Low Radiation Techniques (LRT) conference in April 2013 at Gran Sasso.
Geant and FLUKA versions
It is important in such a study to be very specific about what physics models are involved in simulations. Typically this is stated through version numbers of either Geant4 or FLUKA. Formally this is not enough by itself for Geant4 since the physics list is modular and can be changed even within one compiled versions. For now a simple specification of the versions used in this page are included, to be updated and made more specific later:
- Geant4.9.5
- FLUKA 2011.2 patch level 17 (Dec 2012)
plots
Several of the more important plots can be viewed below in separate sections and additional plots are available here.
energy flux
As muons propagate through a cylindrical volume they begin creating neutrons and eventually the flux through the cylindrical area comes to constant. This means in the first small percentage of the cylinder the flux is increasing and after that one can reliably extract the flux. Below we plot the integrated flux (over the whole 10m sensitive cylinder) as a function of energy.
for Borexino scintillator we plot the integrated flux as a function of neutron energy for several muon primary energies
