1. Nuance / Neut comparison  Comparisons on a generator and simulation level (all information is read from.root files produced by Geant)  Neut file: 20.000 evts from h2o.neut4.5.1.flux04b_40GeV_2.5deg.nd5.001.nfsi.nt  Guessing from the name (h2o*), these events are generated on water!

2. Generator/Simulation: Number of muons (all and primary)  Less muons in neut ( =0.71, =0.75) nuance neut

3. Generator/Simulation: Number of protons (all and primary)  Less protons in neut ( =1.1, =1.5 for primary protons) – a significant difference nuance neut

4. Generator: Momentum distributions of primary muons and protons  Muons much softer in neut Averages in MeV/c Muons (1Mu-) Muons (1Mu-, 1P+) Protons (1Mu-, 1P+) 582561610 677664649 nuance neut

5. Simulation: Number of muon hits in SMRD per event  Vertices in the whole detector (including the magnet)  Slightly less hits for neut nuance neut

6. Notes for neut files  Sometimes (25evts in 20000) the trajectory container is missing (??)

7. Some questions  The detector is situated off-axis. This means that the flux may change from top to bottom. As far as I understand this is not taken into account in the simulation (the distribution of vertices depends on the material density only). Am I right?  The detector is 2.5deg off-axis, but it’s large enough to catch neutrinos from (very approx.) 1.75deg to 3.25deg (this is including the magnet; 2.20 to 2.80 for the basket). This may influence the energy spectrum. I’m not sure whether this was taken into account in Neut files that we’re now using.